Moparts

Big block a518 overdrive conversion (lots of pics)

Posted By: adventurer

Big block a518 overdrive conversion (lots of pics) - 04/22/07 01:23 PM

I am in the proscess of putting an a518 overdrive trans in my 440 powered 2wd truck. Thought you all might like to know and see how I do it. First let me start off by saying I am no expert on this by no means. This is the first time I have tried this, so I'm sure there will be some problems along the way, but here goes. Thanks to Ric aka 77440se and a few web sites http://www.transmissionsone.com/
http://www.racewithjw.com/
I got all my info and parts.
I have assembled all my parts: Transmission a518 93 2wd with lockup, JW Ultra Bell, vacum switch, etc...
This weekend I have done the first major step which is cut the old bell housing off to make room for the new Ultra Bell.

You see the trans and the bell housing. I made a few reference marks the black dash marks on the trans. for refence. I used a level and square to measure into the pump rail, which is how far you have to cut the bell housing back.

Made my first cut. A lot hard to do than I thought it would be. Used a sawzall with a metal blade. Burnt up two blades before I figured out slow the blade speed down and it cut great and doesn't burn up the blades.


After the first cut I took my 4 1/2" grinded with a grinding wheel and roughed it on back. Then switched to a 60 grit sanding disc on the same grinded to finish. You have to make sure you have clearnce all the way around the outside of the bell or when you are bolting the bell to the pump it doesn't bolt down tight against the pump. Thanks Ric for the tip on that. Down at the trans pan rail is the area you need to watch close for clearence.




And here it is all test fitted. Only snags this day. 2 burnt up saw blades and the bolts that were sent with the Ultra Bell were to long. A few bolts and blades problems solved. A lot of time involved in this step. From what I see of doing this probably the most time consuming and hardest part, but we'll see. I'll keep you posted as the project goes along. Hope you found this useful.
Posted By: hp383

Re: Big block a518 overdrive conversion (lots of pics) - 04/22/07 02:04 PM

this definately needs to be in the tech archives.

You might also consider sending this to the ramchargercentral.com board as a "How To", I as sure they would like to have this info.
Posted By: Jwilli500

Re: Big block a518 overdrive conversion (lots of pics) - 04/22/07 03:02 PM

Please DO keep us posted as I for one am VERY interested! Thanks!
Posted By: 70Challengerse

Re: Big block a518 overdrive conversion (lots of pics) - 04/23/07 01:33 AM

Nice job Larry,should be shipping some parts your way this week...
Posted By: Sub95

Re: Big block a518 overdrive conversion (lots of pics) - 04/23/07 03:30 AM

With the ultr bell do they give you the sapacer for the crank? wanting to put my 440 in my ram
Posted By: NotEnufGarage

Re: Big block a518 overdrive conversion (lots of pics) - 04/23/07 03:33 AM

I think that's the point of the Ultrabell, versus an adapter plate. You won't need a spacer for the crank since the Ultrabell puts the torque converter and therefore the flexplate at the right depth.

With an adapter plate, you have to make up for the thickness of the plate.
Posted By: Sub95

Re: Big block a518 overdrive conversion (lots of pics) - 04/23/07 04:04 AM

Sweet, if you dont mind me asking how much was the ultra bell? u can pm if you want.

Thanks
Posted By: Pat_Whalen

Re: Big block a518 overdrive conversion (lots of pics) - 04/23/07 04:32 AM

Quote:

Sweet, if you dont mind me asking how much was the ultra bell? u can pm if you want.

Thanks




Their catalog lists it at $284.67
Posted By: chrisf

Re: Big block a518 overdrive conversion (lots of pics) - 04/23/07 04:46 AM

Larry and Ric,
what have you guys done for the shifter linkage seeing that the ear gets cut off for the bellhousing ?
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 04/23/07 10:18 AM

Ultra bell was $310.48 plus shipping $326.41. The price in the online was an old listing.
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 04/23/07 10:23 AM

Yeah Chrisf the ear is gone. There will have to be a bracket made to fix that. Also the use of a kickdown linkage cable as well. Those items I'll show what I do as I do them.

On new developments of the project worked on other things on the truck most of the day yesterday, but did get the 727 trans out of the truck to make room for the A518. Also needed the driveshaft out to take to the shop to shorten the drive shaft 3 1/2". That will be done today.
Posted By: RedRam

Re: Big block a518 overdrive conversion (lots of pics) - 04/24/07 01:28 AM

Great post. This is something I would like to do myself.
Is there a horse power limit to the bolt-on ultra bell?
Troy
Posted By: 3XCHARM

Re: Big block a518 overdrive conversion (lots of pics) - 04/24/07 01:38 AM

It is listed as SFI approved for drag racing, so I would imagine that it is only limited to the amount of power the tranny can handle. But I too am curious if anyone has found any specific info on this.
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 04/24/07 02:14 AM

Well for today the drive shaft has now been shortened 3 1/2". And I drilled the new holes to move the cross member back. You have to move the cross member back and you can still use the original mount and cross member but have to make a plate to adapt the mount to the trans. That will happen after the trans is in the truck. This moving the cross member moves it back about 6". Here is a picture of my test fit to give you an idea.

You have to drill three holes two in the lower frame rail and one in the upper. You can't see the upper one in the picture but it is a pain to drill and get the bolt in because the cab is setting so close to the frame. Elongate that back top hole so you can get the bolt in from the top, or use a really short bolt so it doesn't hit the floor pan coming up from the bottom. I chose the elongate method with a bolt from the top side. You can see in the picture the original top front bolt, I couldn't get it out because of the cab being so close to the frame. I just put a nut on it and tightened it up in place so it doesn't rattle around. Well thats about it for today.
As to the horse power limits of the Ultra Bell I really don't know either. You could call JW Performance and ask them. They were really nice and helpful when I called them. I am sure they could answer that question.
Enjoy
Posted By: dynotune440

Re: Big block a518 overdrive conversion (lots of pics) - 04/24/07 05:14 AM

AWSOME!
it is going to be interesting to see what kind of mileage that you end up getting out of it. Are you going to be changing the axle ratio....I see 3.55 or 3.91 in the future......
Posted By: Mr.Yuck

Re: Big block a518 overdrive conversion (lots of pics) - 04/26/07 05:00 PM

wonder if you could do that say in a 70 charger???
Posted By: 3XCHARM

Re: Big block a518 overdrive conversion (lots of pics) - 04/27/07 01:11 AM

Quote:

wonder if you could do that say in a 70 charger???





"ANYTHING" is possible, but I think you will have to modify the tranny tunnel area a lot.
Here is another (pricey) choice for an over drive:


http://www.keislerauto.com/mopar/transmissions/automatic-4sp.asp




Not trying to hijack this post. I am very grateful for the pics and info on this swap now that 2 members here have done it, I am probably going to try this one myself.
Posted By: 70Challengerse

Re: Big block a518 overdrive conversion (lots of pics) - 04/29/07 01:10 PM

What did you run out of pics????
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 04/29/07 02:19 PM

Quote:

What did you run out of pics????




No Hadn't been much to show in last while was waiting on some gaskets. Finally had those and started back on project last night. I removed the pump to replace the gasket behind the pump. With taking those pump bolts loose I figured I should replace it.

First thing to do to remove the pump, break the jam nut shown loose and tighten the screw that is shown to keep the trans together when you remove the pump.

Next remove the pump. There is really a slide hammer tool for doing this, but I didn't have it, so I took two pieces of 3/8" all thread a couple of nuts and larger nuts, my 2" & 1 7/8" sockets and made my own slide hammer tool. These screw in at about the 9 & 3 o'clock postitions once you have the pump bolts out. Remove and replace the gasket behind the pump. This gasket only has one direction it will go on, make sure it lines up. Next you need some guides studs to put it back together, I used 5/16" all thread for guide studs. Lube up the o-ring around the pump and place the pump over the guide studs. Install pump.

On the Ultra Bell there are some O-rings that need to be installed place them at the bolt holes as shown. Besure to put a little sealant on the bolts as trans fluid can leak around them. Tighten all the grade 5 or better bolts to 20 ft/lbs. I used grade 8 bolts. Besure to loosen the bolt that you tightened earlier to keep the trans from coming apart as you removed the pump. Loosen the bolt about 1 1/2 turns, tighten the jam nut.
I would have been installing the trans last night but the parts store gave me the wrong trans filter kit. It was to deep and wouldn't let the pan bolt on. I'll pick the right filter up today and be putting it in later on today.
Posted By: Magnum

Re: Big block a518 overdrive conversion (lots of pics) - 04/30/07 05:32 AM

The first few pictures looked pretty crazy but after seeing the last ones. Am I correct in seeing it's the pump locating the Ultrabell and not the old case where it was cut?

I had a 518 swapped into my 87 Ram. I also moved the crossmember back but used a 92-93 crossmember with a 3 bolt transmission mount.

I didn't really see much change in the mileage. The overdrive just allowed me to drive faster. Same when I lost the overdrive. I went back to driving slower on the highway and with the slower speeds, mileage didn't drop much if any at all.
Posted By: 3XCHARM

Re: Big block a518 overdrive conversion (lots of pics) - 05/01/07 01:02 AM

Quote:

I didn't really see much change in the mileage. The overdrive just allowed me to drive faster. Same when I lost the overdrive. I went back to driving slower on the highway and with the slower speeds, mileage didn't drop much if any at all.





If you put an overdrive in and then spin your motor up to the same rpm (going faster than your comparison speed) then no you wont see a mpg gain. But, if you go THE SAME SPEED then all things being equal the rpms will be lower and that is where you get the mpg increase.
Posted By: Webster

Re: Big block a518 overdrive conversion (lots of pics) - 05/01/07 02:37 AM

Great Info Larry, is it in yet??
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 05/02/07 01:52 AM

Quote:


I didn't really see much change in the mileage.




Boy I hope this is not true for me. I know of one truck like mine that has this done getting about 3-4mpg on the highway more than me. We'll see though. I know what my truck used to get and as soon as it's done I'll report the diffence.
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 05/02/07 03:21 AM

Well I knew it had to happen sooner or later I have run into the first few snags on installing the trans. Let me share a few pics and I'll explain.


The finished trans all ready to install. Now for the problem. The trans went in OK, bolted to engine just like it should. But when I postioned the trans where it needed to be it hit the floor pan with the two thing I have marked with purple arrows in the pictures above. Let me back track a minute, I knew where to position the trans based on my truck is setting on 4 jack stands. I placed a level on the breather before I ever took anything loose and recorded what it read. So with the a518 in place all I had to do was keep raising the trans till the level on the breather read like it did before I started. Now back to the interference problem. Passenger side a bolt boss, drivers side a pressure boss. Had I known before the trans went in it would have been an easy fix. But I didn't. The bolt boss was easy let the trans down some and cut it off with a sawzall. The other side was a lot trickier. Really hard to ding the floor pan in with the trans in the way. It would have taken about 5 minutes had I known ahead of time but live and learn.

Picture of clearence on passenger side after cutting.

Picture of drivers side after denting floor in tunnel area. These pics aren't to great best I could do in tight areas. On the dent in floor there is already a dimple in floor in front of where you need one you just have to dent the floor behind that. You can kind of tell that from the pics.
Next problem Cross member. I know Ric aka 77440se made his original cross member and mount work but after several test fits I really just didn't like the way it was working out. So I decided to go a differnt route. The original a518 mount bolts on to a plate with three mount holes. The front two holes line up almost exactly where the original mount in my truck was. So I have decided to get a brand x mount actually a mount from a 90' Chevy truck 305 700r4. It almost bolts perfectly to the trans just have to elongate the holes in the mount a little to the inside and it bolts right up to the trans.

From there I am going to have a single stud mount straight down to mount to a cross memeber that I am going to make from scratch from 2" 1/4"wall box tubing a cross memeber that will bolt up in the orignal place on the truck, (Yeah so I wasted all that time earlier drilling holes). Metal will be here tomorrow. I'll show you how I make this work out. I think it should be pretty sweet.
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 05/03/07 04:56 AM

Well tonight I got my crossmember pretty well made. It is just tack welded together at this point but heres a picture so you can get an idea of what I'm doing. Tomorrow it will be welded together very well and ready to install.
Posted By: Magnum

Re: Big block a518 overdrive conversion (lots of pics) - 05/03/07 09:05 AM

Quote:

Quote:


I didn't really see much change in the mileage.




Boy I hope this is not true for me. I know of one truck like mine that has this done getting about 3-4mpg on the highway more than me. We'll see though. I know what my truck used to get and as soon as it's done I'll report the diffence.




You're taking this quote out of context adventurer. Let me explain in numbers.

I was getting about 18mpg. Mixed city and highway with my 360 Ram. Confident it was over 20 straight highway but that's beside the point here. During my highway commute I regularly drove 120km/hr @ 2100rpm.

When I lost the od in my 518 I continued to drive it for the rest of the year using D on the highway. Not comfortable with the high Rpm's in 3rd with 3.55's. I decided to drive 100-105km/hr.
My mileage stayed around 17-18mpg.

Didn't actually try to test mileage in 3rd at 120km/hr but I'm sure it would have been less.
Posted By: 76440

Re: Big block a518 overdrive conversion (lots of pics) - 05/10/07 07:02 AM

How is the swap going?
Posted By: 3XCHARM

Re: Big block a518 overdrive conversion (lots of pics) - 06/11/07 05:10 AM



No more updates? I am dying to see what has become of the tranny mount.
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 06/28/07 04:17 AM

Well hello all. I am sorry for the long time between updates here but I had some problems. I had a two period there that I was down and out with a back injury and couldn't work on it and I have a home remodel project that seems to have taken over my life that put a real slow down on this project. Also I was taking pictures all along of the progress and my Daughter deleted all of the new pics on the camera by accident. So all pictures from here on out are after everything is in place and running. So I left off on the cross member. I got the cross member all made and had it powder coated. I have access to a powder coater so I can get that done for free.
Turned out nice. I changed the mount I used a Napa #620-1070 instead of the #620-1233 I have pictured. The stud is offset a bit and made everything line up better with the orignal mounting holes.


So now that worked out nice and it was time to make the shifter linkage bracket on the trans bell. I made it out of 3/16" plate formed it around the bell made an L in it to mount the shifter bracket and drilled and tapped two hole in the bell housing. Also had to make a little bracket to attach the kickdown cable return spring. These two brackets have arrows pointing at them.

Next on to the pressure switches, the pressure switches go into the trans at the pressure port that is shown in picture #14 of the post. It is a 1/4" pipe plug locatated just in front of the purple arrow in that picture. You will need to be sure you have floor pan clearence here as well. I used a short 1/4" nipple out of the trans then a 90 degree fitting a couple of 1" long nippels and a tee to plumb this for the 44psi & 52 psi switches. 44psi is for the overdrive and 52 psi is for the lockup torque converter. On a side note I used the A518 flex plate it bolted right up to my crank and of course it bolted up to torque converter.

Vacum switch was installed on frame rail, vacum line ran from vacum port behind carb.

The wiring of all this is pretty straight forward.
You run a switched power wire with an inline fuse to the vacum switch. Then run the other lead of it to the middle wire on the three wire trans plugin. The other two wires of the trans plug are to establish ground not power. Front wire is overdrive, rear wire is lockup. Take the front wire on the trans plug run it to a toggle switch which I mounted in an already drill hole in my dash, run from the toggle switch to one side of the 44psi switch. Don't hook the other side of the psi switches to anything they are self grounding when they get to the desired pressure. Run the rear wire from the trans plug to the 52psi switch and your done wiring.
Now onto the kickdown cable I used Lokar cable #KD-272HT. Worked like a charm after fabricting more brackets. I had to make brackets at the carb so the cable would be pulled as I step on the gas pedal also a small L braket to hold the cable still. Brackets have arrows pointing to them.

On the cable at the trans I used the orignal cable bracket from the A518 to mount the cable.

I had to use my orignal shift lever for the trans as the hole where the shift linkage clipped to was to large. The shift lever simply unbolts and the orignal one bolted right on. Kickdown lever is the A518 one. Used orignal 727 dipstick & tube. Seemed to read right with fluid. Made new trans lines you'll have to get a couple of adapter fitting for you lines.
Well at this point I'm pretty close and then I ran into a big problem. I hadn't put the starter in yet. So I got to put it in place and low and behold it won't fit. I try to put it in the bell housing it stops about 1/2-3/4" short of bolting flush to the bell housing. I work and work and it still don't fit Finally I get the starter one time to sort of start into place so I think the bolts will pull on in. BAD IDEA

Broke the nose right off the starter. So this is on a Sunday no way to call the people that made the bell to get help. So I guess that maybe they made the Bell for a late model mini starter. So I go get a mini starter. The mini starter won't go either. To line up with pilot hole in the bell where the nose on the starter goes the mini starter is hitting the block. So I quit for that day. Monday morning I am on the phone with JW trying to figure out the problem, "we've never had a problem out of these bells" I'm told. "If you'll ship the bell and both starters to use we'll figure it out". This means pulling everything and I do mean everything back apart as this was one of the last things I was doing. I didn't want to but I didn't know what else to do. So apart all my hard work comes. Only good thing about taking this all back out now I could make better dents in the floor pan for clearence, remember dent the floor before installing the trans. So now with the trans in the floor I get to trying to figure out the problem. I find that with the old big starter the pilot hole is to small for the nose of my starter to go in. Either my starter nose is bigger than most or they miss machined the bell. My vote is the later (miss machined). So now for the mini starter the nose goes in the hole but lacks about 1/8" of completely seating against the bell. I look at it close. There is no bevel to the edge of the pilot hole in the bell and the starter has a small raised area on it that with no bevel won't go all the way in. so I think easy fix on that just bevel the pilot hole on the bell. I did and now the starter goes all the way in. But I still had a problem with the mini starter hitting the block. So I had another bare 440 block in the garage, I took the bell off the trans and bolted it to the 440 block, put the mini starter up there and it hit the block Now what? So I get to reading some tech articles on Moparts (Thanks Moparts )about mini starters on big blocks hitting the block and having to grind the body of the starter a little and thats what I did and it bolted right up. So with all these issues figured out its back together with it all. But I bolted the starter up as soon as I had the trans in place this time rather than last thing. It fit like a glove, YEAH. So I warn all of you that are using the ultra bell be sure before you ever install it take your starter an fit it into the bell housing. Such a small detail cost me a lot of time and a lot of cusing.
So now that all that was in place I got it finished bolted up. Hooked all my wiring back up, refilled with fluid. Adjusted the kickdown cable per instruction which is to have no slack in cable, as soon as you step on the throttle it should be pulling on the kickdown cable. On first test drive I found this not quite the right adjustment as the trans held the shift from 2nd to 3rd really long and when it shifted it was very harsh. I readjusted it to have about 1/8" slack at idle and it shifted like a champ. Everything worked perfect. I drove it today for the first time put several miles on it, worked great . Trans shifts smooth and easy downshifts very well. Overdrive seems to come on at about 48-50mph step on the throtle vacum drops and it makes it drop right out of overdrive just like it should couldn't ask for any better. So far I like it. I can tell a big differnce in the rpms at highway speed just from listening. Don't have a tach to say (some of you know why but thats a whole nother story) but I'd say at least 1000rpm less than normal. Don't have enough miles to say what kind of mpg differnce it made. I know for sure what I got before. So I will report that as I know. Now in conclusion on this long winded post. Is it worth it to overdrive? It's more work than I thought it would be. More fabricating and figuring out things than I thought there would be. I'd say it's not all that hard most any of you could do it. Even with all the trouble spots I have had it hasn't been that bad other than the starter issue. Remember check the starter first thing & ding the floor pan before the trans is in. I think fabbing a cross memeber is a better deal than tring to make the orignal work. Worked better for me. As of right now I'd say I can tell a big difference in the way the truck drives. Shifts so well and just all around seems better. I like it. I will let you know about mileage as soon as I have a true figure. I have a 100 mile drive coming up to Knoxville TN on July 14th so I should get some good data on highway milage then.
I hope you found all this useful and not to boring. If you have any question about how I did anything or how any of this worked just ask I'll do my best to answer. I will be more available now than I have been.
Thanks
Larry
Posted By: 3XCHARM

Re: Big block a518 overdrive conversion (lots of pics) - 06/28/07 04:56 AM

Wow, very comprehensive and helpful!


I think I have finally made my decision about doing this swap as well. Now I just need to find a 518 and get me a JW Bell!

Thanx a whole heap for the pics. adventurer!

Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 06/29/07 04:34 AM

Your Welcome.
Posted By: PlumCrazyChris

Re: Big block a518 overdrive conversion (lots of pics) - 06/29/07 03:47 PM

Larry that is an awesome post, so well put together and excellent explanations. I think if the conversion was hard for you, then you just made it MUCH easier for everyone else that will follow in your footsteps. I just copied your post into a doc. I hope you don't mind, to share with the other members of the Austin Mopar club. I think a lot of them will be very interested in this conversion now that you've laid it all out for them.

I think your right about fabbing your own crossmember, I was kinda leery about cutting up my original anyway.

Thanks so much for sharing all your hard work! I'm sure I'll have many more questions to come with my own overdrive conversion.

Chris
Posted By: Jwilli500

Re: Big block a518 overdrive conversion (lots of pics) - 06/29/07 09:36 PM

Hey Mods! this thread needs to be archived!
Posted By: 3XCHARM

Re: Big block a518 overdrive conversion (lots of pics) - 06/30/07 02:47 AM

Quote:

Hey Mods! this thread needs to be archived!




I Second That!
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 06/30/07 03:35 AM

Quote:

Larry that is an awesome post, so well put together and excellent explanations. I think if the conversion was hard for you, then you just made it MUCH easier for everyone else that will follow in your footsteps. I just copied your post into a doc. I hope you don't mind, to share with the other members of the Austin Mopar club. I think a lot of them will be very interested in this conversion now that you've laid it all out for them.

I think your right about fabbing your own crossmember, I was kinda leery about cutting up my original anyway.

Thanks so much for sharing all your hard work! I'm sure I'll have many more questions to come with my own overdrive conversion.

Chris



Thanks Chris,
I'm glad you really liked it, I hope it helps you or someone else along the way.
A couple of things to consider that I didn't say before about doing this conversion. This is in a truck application, in a car your going to have a whole nother set of floor pan issues. Also I am running a steel crank 440 engine. On steel crank engines they are internally balanced, no added weight on torque converter. If you are running a cast crank 440 engine you will need a balanced flex plate or some kind of a balanced torque converter. Maybe one from a 360 would work not sure on that someone better on transmission could answer that. Or maybe knock the weight off your 440 T.C. and tack weld it to the Lockup T.C. in the postion it was on the 440 T.C. On the cross memeber deal, I could have made the original work without cutting it by drilling the holes I did and didn't use in the early part of this post and then fabbing some kind of mount from the trans to it. But you have to space the orignial cross memeber about 3/4-1" away from frame rail at top with long bolts and washers and I just didn't like the way it was working out. I like mine better. It fits well and is solid as a rock.
Larry
Posted By: dodgeram440

Re: Big block a518 overdrive conversion (lots of pics) - 06/30/07 04:03 AM

Quote:

Also I am running a steel crank 440 engine. On steel crank engines they are internally balanced, no added weight on torque converter. If you are running a cast crank 440 engine you will need a balanced flex plate or some kind of a balanced torque converter. Maybe one from a 360 would work not sure on that someone better on transmission could answer that. Or maybe knock the weight off your 440 T.C. and tack weld it to the Lockup T.C. in the postion it was on the 440 T.C.
Larry




I wasn't aware that the cast crank 440s had weights on the converter or flexplate. My cast crank 440 has a balancer that says "used on cast cranks only". Am I still going to need a weighted converter to put my 727 behind it in my truck? I don't have the original converter anymore so I can't verify if it had any weights on it.
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 06/30/07 04:16 AM






I wasn't aware that the cast crank 440s had weights on the converter or flexplate. My cast crank 440 has a balancer that says "used on cast cranks only". Am I still going to need a weighted converter to put my 727 behind it in my truck? I don't have the original converter anymore so I can't verify if it had any weights on it.



Yes you will need a torque converter with a weight or an aftermarket flexplate that is weighted.
Posted By: PlumCrazyChris

Re: Big block a518 overdrive conversion (lots of pics) - 07/03/07 10:31 PM

Quote:

Quote:

Also I am running a steel crank 440 engine. On steel crank engines they are internally balanced, no added weight on torque converter. If you are running a cast crank 440 engine you will need a balanced flex plate or some kind of a balanced torque converter. Maybe one from a 360 would work not sure on that someone better on transmission could answer that. Or maybe knock the weight off your 440 T.C. and tack weld it to the Lockup T.C. in the postion it was on the 440 T.C.
Larry




I wasn't aware that the cast crank 440s had weights on the converter or flexplate. My cast crank 440 has a balancer that says "used on cast cranks only". Am I still going to need a weighted converter to put my 727 behind it in my truck? I don't have the original converter anymore so I can't verify if it had any weights on it.




Or you just need an earlier 518 thats not a lockup, then you can use any torque converter, stock or aftermarket for your application. I knew aftermarket converter will run $2-300 I bet. and LU converter selection is limited.

Larry were able to find a LU converter for yours?
Posted By: SANDYinNS Canada

Re: Big block a518 overdrive conversion (lots of pics) - 07/03/07 10:46 PM

Quote:

Quote:

Quote:

Also I am running a steel crank 440 engine. On steel crank engines they are internally balanced, no added weight on torque converter. If you are running a cast crank 440 engine you will need a balanced flex plate or some kind of a balanced torque converter. Maybe one from a 360 would work not sure on that someone better on transmission could answer that. Or maybe knock the weight off your 440 T.C. and tack weld it to the Lockup T.C. in the postion it was on the 440 T.C.
Larry




I wasn't aware that the cast crank 440s had weights on the converter or flexplate. My cast crank 440 has a balancer that says "used on cast cranks only". Am I still going to need a weighted converter to put my 727 behind it in my truck? I don't have the original converter anymore so I can't verify if it had any weights on it.




Or you just need an earlier 518 thats not a lockup, then you can use any torque converter, stock or aftermarket for your application. I knew aftermarket converter will run $2-300 I bet. and LU converter selection is limited.

Larry were able to find a LU converter for yours?





440/400 have the same weights if they are cast crank motors.(340 cast crank , 360 and 360 magnum are all different weights!) Most of the cast crank c body converters are 12" narrow ring gear and take a different flex plate than the wide ring gear 11" verson.

The above convertors are non l/u You can weld the weights from a 440 cast crank converter to any converter you swap in there. I've had to do it for customers with 360's 400's you name it.

Watch out for 518 convertors that DO NOT have the one offset bolt. You could probably use one on a 440 cast crank with the coresponding flex plate but you would have to do serious figuring and marking where the weight would go!
Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 07/04/07 11:52 AM








Larry were able to find a LU converter for yours?



Yes, I'm running a Lock-up on mine. The lockup is supposed to give the most mileage increase over the nonlockup. So when I was hunting the trans I made sure I found a LU.
Posted By: Rug_Trucker

Re: Big block a518 overdrive conversion (lots of pics) - 07/07/07 12:01 AM

Posted By: draginmopars

Re: Big block a518 overdrive conversion (lots of pics) - 07/17/07 12:31 AM

Larry,, THANKS for the GREAT post..


My starters won't fit either The pilot hole should be 1 inch or larger.. it is .003 out of round,, I tried both early and late starters.. and YES, needs the bevel for the late starter.. thanks again for the heads up, on starter fit issues.. At least, i haven't installed the trans yet..

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Posted By: draginmopars

Re: Big block a518 overdrive conversion (lots of pics) - 11/24/07 02:28 PM

Larry, did you ever get the starter to fit? I'm getting ready dis-assemble and cut the bell off.
I'm going to en-large the starter pilot hole.

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Posted By: adventurer

Re: Big block a518 overdrive conversion (lots of pics) - 11/26/07 09:49 PM

Yeah I got my starter to fit. I used the late model mini starter and chamfer the edge of the pilot hole on bell, then had to grind on the side of the starter that is close to the block for clearence (per one of the tech articles on the Moparts Tech Page, Thanks Moparts ). If your using the original large starter just enlarge the pilot hole in the bell large enough so your starter slides in easily all the way before you ever put it in the truck.
Posted By: topfueldart

Re: Big block a518 overdrive conversion (lots of pics) - 12/13/07 09:40 PM

Great thread, should be put in archives, as this would apply to all mopar trans installing an ultrabell ..
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