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How would you build a 518 trans for 550hp/torq?
#543983
12/03/09 04:03 PM
12/03/09 04:03 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
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How would you build a 518 to take 550hp/torq in my sig car. Assume 4000 pound car with drag radials. Would be a mostly street car with some strip. I'd say 90% street, 10% strip at most. Overdrive would be setup to run at low load/cruise levels only, not WOT. Not interested in putting power through the overdrive gear.
What parts would you use? I was thinking a good rebuild kit plus the transgo TFOD-HD2 shift kit. What other goodies would you use? Bands? Sprags? Other? Not looking for anything too exotic, engine rpm will not exceed 6000rpm. Any other mods that should be done?
I don't have a trans yet, however the 46RE's are readily available in the yards, the RH's seem to be a bit tougher to find around here. I would just have to go with which ever I could find first. I know tearing into the trans would tell of anything else that needs to be done, but I'm interested in what would have to be done right off the bat for this power level.
Also, I understand the normal 518's will run a 727 converter, but the lockup ones won't. Is there a decent source for lockup performance converters. Not interested in a ton of stall speed, 2700-3000 would be nice.
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Re: How would you build a 518 trans for 550hp/torq?
[Re: DaytonaTurbo]
#543984
12/03/09 04:43 PM
12/03/09 04:43 PM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
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Senior Management
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Irving, TX
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That's not a lot of power for those trannies. You should be fine with a basic rebuild and a shift kit to change the pressures.
Get a 46RE for the upgraded internals and run the 46RH valve body.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: How would you build a 518 trans for 550hp/torq?
[Re: feets]
#543985
12/03/09 04:52 PM
12/03/09 04:52 PM
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Joined: Jan 2003
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U.S.S.A.
JohnRR
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Quote:
That's not a lot of power for those trannies. You should be fine with a basic rebuild and a shift kit to change the pressures.
Get a 46RE for the upgraded internals and run the 46RH valve body.
I don't think that is possible since the RE will not have the HYD gov circuit.
An RH or 518 shouldn't be hard to find , RE is 96 up , but he needs to decide if he wants lockup or not .
Build the OD section to Diesel V10 specs and you'll be fine , everything forward is a 727 , don't worry about the sprag , it's a much better piece in the OD trans , think it's 14 elements in a plastic holder for it and the springs . I broke my output shaft on the trans in my ram power braking against the convertor to build boost with the trans in drive , rear band not applied , didn't hurt it , truck was fixed at the dealer and they didn't do anything other than pull the OD unit to fix , left the trans in the truck .
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Re: How would you build a 518 trans for 550hp/torq?
[Re: JohnRR]
#543988
12/03/09 06:14 PM
12/03/09 06:14 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
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Okay I think I may have been a little confused, or at least I am now, lol. So the 95 and prior 518 with the 3-wire connector for overdrive/lockup is the 46RH? The 518 with the two-wire connector for overdrive and no lockup is also called the 46RH?? What does it take to build the OD section to diesel/v10 specs? I'm just trying to compile a list of parts for now. I was checking out bulkpart.com and they've got most of what I think I need. They've got their performance rebuild kits for a bit over 200 bucks, 150 for the transgo shift kit for od trans. Should I be doing anything else? Bands, accumulator or servo upgrades? Basically I want to put the parts on the shopping list that are going to get done either way, then add anything if there's more wrong with it when I tear it apart. Thanks for the info and keep it comming. 
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Re: How would you build a 518 trans for 550hp/torq?
[Re: DaytonaTurbo]
#543989
12/04/09 06:50 PM
12/04/09 06:50 PM
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Joined: Jan 2003
Posts: 2,077
Oklahoma City
Jwilli500
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Oklahoma City
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RH Lockup (95 and older) is 3 wire RH Non Lockup (95 and older) is 2 wire RE (96 and newer) is Multiwire This is 518(727 based)only, the 500 is a whole nuther deal. 4 = # of forward gears 6 = level of service (strength) (5, 6, or 7) R = Rear wheel drive H = Type of over drive control (Hydraulic or Electronic) I think it's the ATSG manual that has some pretty good info in it if you want to get started aquainting yourself with these trannys. Bulkpart has the manual and a video. I really like having a video. go to: http://www.bulkpart.com/Merchant2/mercha...Product_Count=1
Last edited by Jwilli500; 12/04/09 07:01 PM.
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Re: How would you build a 518 trans for 550hp/torq?
[Re: DaytonaTurbo]
#543992
12/04/09 09:11 PM
12/04/09 09:11 PM
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Joined: Jul 2005
Posts: 1,400
canada
jneuf
pro stock
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pro stock
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canada
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Quote:
The local u-pull should have the trans I need, will just have to make it out there before it gets too much colder outside. 
Better hurry! Is getting cold fast!
Good luck with the OD trans. That should be great for cruising.
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Re: How would you build a 518 trans for 550hp/torq?
[Re: DaytonaTurbo]
#543993
12/04/09 09:40 PM
12/04/09 09:40 PM
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Joined: Jan 2003
Posts: 6,816
Alton, IL
Dakota_Don
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Alton, IL
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Quote:
Thanks for the info. For some reason at first I was thinking the RH was the 2-wire and the RE was the 3-wire. 2-wire or 3-wire which ever I can find at the yard. Not terribly concerned about the lockup. Yeah I saw the ATSG manual and video on there and I think I will pick up both of them. I'm sure I could manage it with just the manual but the video would probably be worth it. I plan to mate motor to trans with a jw ultrabell. The local u-pull should have the trans I need, will just have to make it out there before it gets too much colder outside.
if thats the same VID i have its pretty lame
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Re: How would you build a 518 trans for 550hp/torq?
[Re: jneuf]
#543994
12/04/09 09:50 PM
12/04/09 09:50 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
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Quote:
Better hurry! Is getting cold fast!
Yeah not kidding, better get moving on this soon!
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if thats the same VID i have its pretty lame
Well since I doubt there's more than one 518 video out there I have to ask in what way was it lame? Not much useful info and too much of a general overview? I just checked and that's video's not cheap. If it's crap I'll pass.
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Re: How would you build a 518 trans for 550hp/torq?
[Re: SomeCarGuy]
#543998
12/05/09 05:36 PM
12/05/09 05:36 PM
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Joined: Jan 2003
Posts: 1,771
Jamestown, Indiana
James74
top fuel
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Posts: 1,771
Jamestown, Indiana
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Quote:
How are you going to fit it in your car? Tailshaft is huge.
That was going to be my question. Especially with the isolated t-bar crossmember. That's what's scared me the most about trying this.... Make sure you take lots of pics!
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Re: How would you build a 518 trans for 550hp/torq?
[Re: James74]
#543999
12/06/09 02:22 AM
12/06/09 02:22 AM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
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Quote:
Quote:
How are you going to fit it in your car? Tailshaft is huge.
That was going to be my question. Especially with the isolated t-bar crossmember. That's what's scared me the most about trying this.... Make sure you take lots of pics!
Yeah that's the last main hurdle I've got to work through. I do know it has been done on a 73-74 B body and I've messaged a guy I know who did it, hope he responds. I'm sure someone else on here did it, but the search has been changed to a max range of 1 year.
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Re: How would you build a 518 trans for 550hp/torq?
[Re: DaytonaTurbo]
#544001
12/07/09 02:22 PM
12/07/09 02:22 PM
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Joined: Jan 2003
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U.S.S.A.
JohnRR
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Quote:
What does it take to build the OD section to diesel/v10 specs?
The diesel/V10 od has more clutches and steels in the direct clutch pack , that's inside the unit in the OD case (I can't remember now if I have an extra clutch and steel in there or just tighter clearance need to find my notes) and possibly more pinions in the planet ... not sure on that one but you should be fine with the gasser planet ... The big thing is the clutch and steel count , more cluthes is more holding power , it's also possible to put an extra clutch and steel in the OD clutch pack that is on the rear of the main case , but you have to machine the pressure plate like people have done to put 5 clutches in a 4 clutch drum with the thicker steels. These mods will hold upwards of 1000 plus lb/ft of torque .
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Re: How would you build a 518 trans for 550hp/torq?
[Re: DaytonaTurbo]
#544003
12/07/09 04:51 PM
12/07/09 04:51 PM
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Joined: Jan 2003
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U.S.S.A.
JohnRR
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Quote:
Thanks for the info john, sounds like the overdrive and extra clutch mods are likely overkill for my plans for the car. Since I have no intention of putting a roll bar in the car I won't be going that fast down the strip with it. I seem to recall some mods having to do with enlarging the oil supply holes in the OD shaft. Is this worth looking into or can I just leave it as-is?
I don't think it's overkill , you don't have to do the mods that are done to my trans , my truck is not stock , but the diesel and V10 put out over 400lb/ft of torque , the gasser were only 350ish. I would at minimum go the the Diesel/V10 clutch pack specs , it's not expensive and it's not going to hurt , especially the increase in clutches for the DIRECT clutch pack , it's not a straight thru output like a 727.
I would like to put one of these trans in a passenger car , I might talk a friend into it in the future once he starts  that his engine is running at 187 degrees on the highway at 90mph ...
You can drill the oil hole that will help , also get the sonnax rear piston support, it's modified to increase oil flow/decrease leakage and changes the oiling to the rear drum support surface.
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Re: How would you build a 518 trans for 550hp/torq?
[Re: JohnRR]
#544004
12/08/09 02:51 AM
12/08/09 02:51 AM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
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Hey john, I found this pdf somewhere, it's got an exploded view and parts breakdown for the a-500 trans. I will buy the correct manual, but for now this is something to look at and should be fairly close to the 518... Now when you add an extra clutch/steel to the OD direct clutch pack, do any mods need to be done or will the extra clutch/steel go right in? Also when you say you can mod to add an extra clutch/steel to the OD clutch pack in the rear of the main case, are you talking about the clutch pack this pdf diagram refers to as the "rear clutch"? Then the pressure plate it refers to as part "20" needs to be milled down by the thickness of an extra clutch/steel? Also do you have any info on the drilling of the holes in the od shaft? Do you drill the holes in only the one shaft? Do you know to what size, or just the next size up? I saw the sonnax rear piston setup for sale and it's not expensive at all so if it's a good idea I'll go for it. Also, will a 727 governor kit work? Reason I ask is crt sells a 5800rpm governor kit for a 727 that I would really like. As you can tell I'm a transmission newbie but not afraid to learn.  Just want to do a half way decent job of setting this thing up the first time.
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Re: How would you build a 518 trans for 550hp/torq?
[Re: DaytonaTurbo]
#544010
12/09/09 08:57 PM
12/09/09 08:57 PM
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Joined: Feb 2003
Posts: 10,201
Someplace you aren't
SomeCarGuy
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Unless you known the people, I bet 30 bucks is going to be a fairly good price for what you need, and you know it will work since it is something they do every day. Well, in theory anyway
I want my fair share
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