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Finally a BB automatic overdrive tranny! #1702043
11/22/14 10:37 PM
11/22/14 10:37 PM
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Florida
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mopar346 Offline OP
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Anybody know about these? Anyone have any experience with them? Wonder how much?

http://tranztechtransmission.com/dubuque-ia-overdrive-transmissions.htm


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Re: Finally a BB automatic overdrive tranny! [Re: mopar346] #1702044
11/22/14 11:14 PM
11/22/14 11:14 PM
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Oklahoma City OK
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If they can't quality check their add I'd be reluctant to give them a tranny. i,e, "GET THE OVERDRIVE CONVERSATION FOR YOUR TORQUEFLITE BIG-BLOCK!" Conversation, really?

Re: Finally a BB automatic overdrive tranny! [Re: Cudajon] #1702045
11/22/14 11:19 PM
11/22/14 11:19 PM
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up yours
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Quote:

If they can't quality check their add I'd be reluctant to give them a tranny. i,e, "GET THE OVERDRIVE CONVERSATION FOR YOUR TORQUEFLITE BIG-BLOCK!" Conversation, really?




Add? really?

See, it can happen to anyone can't it?


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Finally a BB automatic overdrive tranny! [Re: Cudajon] #1702046
11/22/14 11:25 PM
11/22/14 11:25 PM
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Hamtramck, PA
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Quote:

reluctant to give them a tranny.




Transvestites are people too, so they should neither be sold or given away.

Re: Finally a BB automatic overdrive tranny! [Re: Alaskan_TA] #1702047
11/22/14 11:37 PM
11/22/14 11:37 PM
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Florida
BDW Offline
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Sounds like a 518 to me, maybe they just do the bell housing mod for you?

Re: Finally a BB automatic overdrive tranny! [Re: Cudajon] #1702048
11/22/14 11:40 PM
11/22/14 11:40 PM
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Florida
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mopar346 Offline OP
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Quote:

If they can't quality check their add I'd be reluctant to give them a tranny. i,e, "GET THE OVERDRIVE CONVERSATION FOR YOUR TORQUEFLITE BIG-BLOCK!" Conversation, really?




Most people (shops anyway) hire people to run their websites, so I wouldn't exactly hold that against them. I was thinking more of just getting a case from them and having my builder build it.


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Re: Finally a BB automatic overdrive tranny! [Re: Supercuda] #1702049
11/22/14 11:41 PM
11/22/14 11:41 PM
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Florida
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mopar346 Offline OP
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Quote:

Quote:

If they can't quality check their add I'd be reluctant to give them a tranny. i,e, "GET THE OVERDRIVE CONVERSATION FOR YOUR TORQUEFLITE BIG-BLOCK!" Conversation, really?




Add? really?

See, it can happen to anyone can't it?




You cant write this stuff.


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Re: Finally a BB automatic overdrive tranny! [Re: Alaskan_TA] #1702050
11/22/14 11:43 PM
11/22/14 11:43 PM
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Florida
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mopar346 Offline OP
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Quote:

Quote:

reluctant to give them a tranny.




Transvestites are people too, so they should neither be sold or given away.




I'll have to take your word for that Barry, I know Alaska gets really cold but................

PA aiunt much better by the way.


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Re: Finally a BB automatic overdrive tranny! [Re: BDW] #1702051
11/22/14 11:44 PM
11/22/14 11:44 PM
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Florida
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mopar346 Offline OP
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Quote:

Sounds like a 518 to me, maybe they just do the bell housing mod for you?




Yep, from what I understand they cut a 727 bell off and graft it to a 518 case. Thought about doing it locally but looking for input.


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Re: Finally a BB automatic overdrive tranny! [Re: Alaskan_TA] #1702052
11/23/14 01:18 AM
11/23/14 01:18 AM
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Bend,OR USA
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Cab_Burge Offline
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Quote:

Quote:

reluctant to give them a tranny.




Transvestites are people too, so they should neither be sold or given away.


Nor be allowed on the streets to mix with and talk to kids or regular people, put them in with the rest of the crazys


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Finally a BB automatic overdrive tranny! [Re: Cab_Burge] #1702053
11/23/14 01:35 AM
11/23/14 01:35 AM
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Western Md.
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Cab...


...FAFO...
Re: Finally a BB automatic overdrive tranny! [Re: mopar346] #1702054
11/23/14 01:13 PM
11/23/14 01:13 PM
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Irving, TX
feets Offline
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Quote:

PA aiunt much better by the way.





I hope that ain't what I think it is.



Sorry, had to continue with the trend.


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
Re: Finally a BB automatic overdrive tranny! [Re: mopar346] #1702055
11/23/14 02:15 PM
11/23/14 02:15 PM
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Wichita
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GY3 Online content
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Quote:

Quote:

Sounds like a 518 to me, maybe they just do the bell housing mod for you?




Yep, from what I understand they cut a 727 bell off and graft it to a 518 case. Thought about doing it locally but looking for input.




Ultrabell bellhousing.

It still doesn't solve the problem of the girth of the 518 interfering with the floorpan and torsion bar crossmember...

Re: Finally a BB automatic overdrive tranny! [Re: GY3] #1702056
11/23/14 04:29 PM
11/23/14 04:29 PM
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Alberta
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rustbuckett68 Offline
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"external overdrive' and 'only two feet longer'.

Re: Finally a BB automatic overdrive tranny! [Re: rustbuckett68] #1702057
11/23/14 06:29 PM
11/23/14 06:29 PM
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bboogieart Offline
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Can you really get 25 to 30 percent better gas mileage?


I have mechanical Aptitude.
I can screw up anything.
Re: Finally a BB automatic overdrive tranny! [Re: GY3] #1702058
11/23/14 06:39 PM
11/23/14 06:39 PM
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Florida
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mopar346 Offline OP
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Quote:

Quote:

Quote:

Sounds like a 518 to me, maybe they just do the bell housing mod for you?




Yep, from what I understand they cut a 727 bell off and graft it to a 518 case. Thought about doing it locally but looking for input.




Ultrabell bellhousing.

It still doesn't solve the problem of the girth of the 518 interfering with the floorpan and torsion bar crossmember...




That's why I am looking for input, what started this is a picked up a Aug 08 collector's guide and it had an article on it that claimed a direct bolt in with no major modifications to the floor pan. They use a special tranny crossmember and shorten the drive shaft but don't talk about any mods to the floor or tortion bar mount. Seems like this would be popular knowledge at this point IF it were true but if no one here has any direct knowledge of it one would have to doubt the claims.

As for 25-30% increase in MPGs, a lock up will give you close to 10% I think so a .60-70 to one ratio would help and keep in mind 25% or 12 MPG is only 3 MPG. It would be basically like changing from a 3.91 gear to a 2.94 gear.


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Re: Finally a BB automatic overdrive tranny! [Re: mopar346] #1702059
11/23/14 07:16 PM
11/23/14 07:16 PM
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Granite Bay CA
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"
As for 25-30% increase in MPGs, a lock up will give you close to 10% I think so a .60-70 to one ratio would help and keep in mind 25% or 12 MPG is only 3 MPG. It would be basically like changing from a 3.91 gear to a 2.94 gear."

I think your estimate on the gains with the lock up converter are optimistic. a 10% gain? I don't think even in the absolute best case scenario that you'd get more that 4-5% from the converter unless you go from a 5000 stall unit to the lock up type.
The RPM decrease percentage does not always directly translate to the equal gain in mileage.
Example: If you reduce cruising rpms by 25%, it does not mean the mileage will increase by 25%.
I had a Gear Vendors overdrive in my car for about 2 years. I ran a 3.91 gear through the .78 OD. The final drive in OD was 3.05. The best mileage I ever got was 12.81 and I was happy to get that.
I made the same trip a year before with no OD but with a 3.23 diff. I got 11.3 on one tank, 10.8 on another and just figured an 11 mpg average. The comparisons may have been skewed a bit since I drove real easy with the GV to see what the gains would be with the overdrive.

Re: Finally a BB automatic overdrive tranny! [Re: mopar346] #1702060
11/23/14 08:20 PM
11/23/14 08:20 PM
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Northern Pa
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GLR Offline
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Mopar346..
I put an A518 non-lock up into a customers car (1972 Plymouth Duster) and the customer was very happy with the results. I didn't have to cut any holes in the floors, I just had to make some hemispherical indents in the floor/tunnel area for clearance. I had to cut out the center of the torsin bar crossmember and I replaced the support with an 1/8" piece of plate steel formed to shape and had to make my own crossmember. It worked so well that I am going to install an A518 lock up style into my 1971 Charger with a 383 engine.

Re: Finally a BB automatic overdrive tranny! [Re: GLR] #1702061
11/23/14 08:36 PM
11/23/14 08:36 PM
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Florida
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mopar346 Offline OP
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If the tortion bar mount has to be modified then it's a no go for me. Oh well, just hoping that's all.

Thanks for the info.

Frankenduster,
And yea, 10 might be a little hopeful on an increase from a lock up. I wonder what improvement you would have seen if you stayed with the 3.23s?


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Re: Finally a BB automatic overdrive tranny! [Re: mopar346] #1702062
11/23/14 09:01 PM
11/23/14 09:01 PM
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Northern Pa
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GLR Offline
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Well, I had to cut the top center out of the torsin bar frame member because of the size of the overdrive section being so large. I don't know if you would have to do that on a B or E-body car for sure... but I would guess you would have to.

Re: Finally a BB automatic overdrive tranny! [Re: GLR] #1702063
11/24/14 12:51 AM
11/24/14 12:51 AM
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Florida
BDW Offline
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No cutting for E or B bodies, just finished my install, amazing difference.

Good read here, get the LU

http://www.cuda-challenger.com/cc/index.php?topic=84774.msg847873#msg847873

Re: Finally a BB automatic overdrive tranny! [Re: BDW] #1702064
11/24/14 01:09 AM
11/24/14 01:09 AM
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Posts: 6,545
Downtown Roebuck Ont
Twostick Offline
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Is a 518 really 2' longer than a 727? Gotta be a typo.

Quote:

Lockup Torque Converter for Extra RPM decrease (also aides in fluid cooling)
No Modifications to Linkage
Reuses Factory Case Bosses
No Engine Adapter
No Starter Relocation
No Special Computer
No Crank Shaft Spacers
No Special Flywheel
Only 2' longer in length
Keeps Transmission as far forward as possible




Kevin

Re: Finally a BB automatic overdrive tranny! [Re: mopar346] #1702065
11/24/14 02:54 AM
11/24/14 02:54 AM
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Granite Bay CA
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Quote:



Frankenduster,
And yea, 10 might be a little hopeful on an increase from a lock up. I wonder what improvement you would have seen if you stayed with the 3.23s?




That takes the discussion in another direction. I see that some engines may not get better mileage simply because they are revving less. This can be the case with aggressive camshafts where the engine is less efficient at lower RPMs. A stock engine with mild camshaft timing ? Sure.
If I decide to go with an overdrive in the future, I may choose to build a 518. My car is a keeper so any changes I make would not be skewed by thoughts of resale value.

Re: Finally a BB automatic overdrive tranny! [Re: Kern Dog] #1702066
11/24/14 02:18 PM
11/24/14 02:18 PM
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What puzzles me is they say you have to supply a core, but not what kind of core. Lots of typos in that ad, but not all gearheads can spell.....

Is the 0.69:1 overdrive ratio the stock 518 ratio?

When I first got my '64Dog on the road it had 3.91 gears. With 32" tires it got about 14mpg at freeway speeds. The motor was the stock Poly 318. Then I swapped rears for a later (one piece axles) with 3.23s. Mileage didn't change a bit. It made a lot less noise running at 80, so I kept the 3.23s. But there was no mileage gain at all.

R.

Re: Finally a BB automatic overdrive tranny! [Re: BDW] #1702067
11/24/14 02:30 PM
11/24/14 02:30 PM
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Rust Belt, SW PA
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Quote:

No cutting for E or B bodies, just finished my install, amazing difference.

Good read here, get the LU

http://www.cuda-challenger.com/cc/index.php?topic=84774.msg847873#msg847873




In 71-74 b-bodies, early ones the crossmember is located a few inches forward and it's makes a nite and day difference... the center of the torsion bar crossmember needs cut out basically to the floor pan.

When I went to do the swap, I missed that part, thinking it'd be easy like going in an e-body from readings links on cc.com


68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram
Re: Finally a BB automatic overdrive tranny! [Re: Silver70] #1702068
11/26/14 01:38 AM
11/26/14 01:38 AM
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Florida
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mopar346 Offline OP
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Quote:

Quote:

No cutting for E or B bodies, just finished my install, amazing difference.

Good read here, get the LU

http://www.cuda-challenger.com/cc/index.php?topic=84774.msg847873#msg847873




In 71-74 b-bodies, early ones the crossmember is located a few inches forward and it's makes a nite and day difference... the center of the torsion bar crossmember needs cut out basically to the floor pan.

When I went to do the swap, I missed that part, thinking it'd be easy like going in an e-body from readings links on cc.com




This is good information, my thoughts are for my 71 BB Charger 500. I'll read the CC thread but if I understand ya'll correctly it will work without cutting.

The cores they request are actually 2 cores, a 518 and a BB7 27, they graft the 727 bell onto the 518. Everything else is 518, some wiring required for the electronics.


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Re: Finally a BB automatic overdrive tranny! [Re: mopar346] #1702069
11/26/14 04:12 AM
11/26/14 04:12 AM
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Granite Bay CA
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A Moparts member who also is a member at Cuda Challenger.com states that when using the JW Ultrabell, you are limited to a 10" converter since the Ultrabell is so much thicker.

Re: Finally a BB automatic overdrive tranny! [Re: Kern Dog] #1702070
11/26/14 12:19 PM
11/26/14 12:19 PM
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Benton, IL.
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DaveRS23 Offline
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I talked to PTC about converters for this swap. They indicated that there were fewer converter possibilities with the lock up. May not matter to your particular application, but it might be a good idea to check BEFORE pulling the trigger on a lock up tranny if you were going that way.


Master, again and still
Re: Finally a BB automatic overdrive tranny! [Re: DaveRS23] #1702071
11/26/14 01:45 PM
11/26/14 01:45 PM
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Mass.
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80fbody Offline
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I'd look into the 200r4 swap. Smaller and more parts/converters. Same basic deal. Cut off the stock bellhousing and bolt on an aftermarket. If I ever go auto again for the street it's probably where I'd start.

Re: Finally a BB automatic overdrive tranny! [Re: 80fbody] #1702072
11/26/14 05:25 PM
11/26/14 05:25 PM
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Granite Bay CA
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Another advantage of the 200R4 is the gear ratio spread is better.
2.74 first gear, 1.76 second, 1.0 3rd and .67 OD. Closer gear ratios provide less RPM drop during shifts. The taller OD is a slight benefit too. This being a smaller trans, fitment and lighter internal components for faster acceleration are helpful.
ONE drawback: The trans pan on the 200 is looooooog, putting the trans mount back much further. This poses a problem for the trans crossmember. You could fab a custom crossmember and tie it to your subframe connectors if they are fully boxed and welded.

Re: Finally a BB automatic overdrive tranny! [Re: Kern Dog] #1702073
11/26/14 11:10 PM
11/26/14 11:10 PM
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I like the idea of keeping it all Chrysler but the 200 would be cheaper to build that's for sure, maybe not depending on the power it will hold. I have considered swapping it to a 833 O/D but not really wanting a standard in this one.


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Re: Finally a BB automatic overdrive tranny! [Re: mopar346] #1702074
11/26/14 11:50 PM
11/26/14 11:50 PM
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colorado
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savoy64 Offline
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on that 200r--- a tranny guy told me you had to throw away all the internals and buy really expensive race parts to make it work---maybe $2000 worth of stuff----sounds like a deal to me----i always thought the 700r was a good hot rod tranny until i found it even needs some serious upgrades-------now my idea is of using a BB 727 4x4 tranny with some type of bolt on overdrive---you know where the transfer case bolts on---seems like some one could engineer that fairly easy----you could turn your 727 into a 6 speed auto-----dont know about a lock up converter though.....

Re: Finally a BB automatic overdrive tranny! [Re: savoy64] #1702075
11/27/14 02:38 AM
11/27/14 02:38 AM
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Granite Bay CA
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That whole " three speed into a six speed" schmere never appealed to me. If I had paddle shifters, sure. Otherwise the clumsy action of a dimmer switch for OD was impossible to do with the intentions of going faster than I could in direct drive.
If you have a real RPM limited engine operating at slow road speeds, the gear splitting might have merit. In an 11 second street car, you'd need more than a toggle or dimmer switch to make it worthwhile.

Re: Finally a BB automatic overdrive tranny! [Re: Kern Dog] #1702076
11/27/14 11:13 AM
11/27/14 11:13 AM
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Guys with modded 6 cylinder turbo Buicks have problems getting the 200 to live so the torque of a BB Mopar is only going to make it worse! Once a friend made enough power in his T-type to run 10.80, he couldn't get the trans. to stay together.

Re: Finally a BB automatic overdrive tranny! [Re: GY3] #1702077
11/28/14 01:16 AM
11/28/14 01:16 AM
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Manitoba, Canada
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Quote:

Guys with modded 6 cylinder turbo Buicks have problems getting the 200 to live so the torque of a BB Mopar is only going to make it worse! Once a friend made enough power in his T-type to run 10.80, he couldn't get the trans. to stay together.





Guys have been saying that for years about the 518's too. How many of us are running 10 second street cars?

Re: Finally a BB automatic overdrive tranny! [Re: DaytonaTurbo] #1702078
11/28/14 08:14 AM
11/28/14 08:14 AM
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Oakdale CT
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Quote:



Guys have been saying that for years about the 518's too. How many of us are running 10 second street cars?




Which I never understood considering its just a 727 with an overdrive slapped on. One which will take the torque of a Cummings diesel.




"I think its got a hemi"
Re: Finally a BB automatic overdrive tranny! [Re: gdonovan] #1702079
11/28/14 04:44 PM
11/28/14 04:44 PM
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Los Osos, Ca
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The 518/618 units get run behind heavily modified truck that weigh upwards of 8k lbs putting out over 600hp and 1500ftlbs tq. The trans does need to be upgraded of course to take it. There are specialty converters running up to 4 disc lock up clutches in them to put up with this abuse. Of course they are expensive too. Another way to go would be to get a donor trans from a 93 back diesel or early production v8 from like 89. They did not run a lock up converter.


Carl Kessel
Re: Finally a BB automatic overdrive tranny! [Re: gdonovan] #1702080
11/28/14 07:55 PM
11/28/14 07:55 PM
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Manitoba, Canada
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DaytonaTurbo  Offline
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
Quote:

Quote:



Guys have been saying that for years about the 518's too. How many of us are running 10 second street cars?




Which I never understood considering its just a 727 with an overdrive slapped on. One which will take the torque of a Cummings diesel.




And anyone who's owned one knows the ones even on stock unmodified Cummins are not known for their longevity. Not saying the 518s are bad, but they're not the holy grail either.

Re: Finally a BB automatic overdrive tranny! [Re: DaytonaTurbo] #1702081
11/28/14 10:51 PM
11/28/14 10:51 PM
Joined: Jan 2003
Posts: 11,894
Benton, IL.
D
DaveRS23 Offline
Special needs idiot
DaveRS23  Offline
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Joined: Jan 2003
Posts: 11,894
Benton, IL.
I don't know of a more durable tranny than a well built 727 for most of what we all do. So, as far as the first 3 gears, a 518 would be as tough as any comparably built 727.

Now I don't know the limits of a lock-up converter or the OD section, but do those really need to hold all of our power in normal driving?

I plan to use a non lock-up 518 in the Cuda next year. The main body will be built just like the 727 in there now which has proven to be nearly indestructible. The OD will be beefed up, but I do not plan to ask it to hold all of power the engine is capable of making.


Master, again and still
Re: Finally a BB automatic overdrive tranny! [Re: gdonovan] #1702082
11/28/14 10:52 PM
11/28/14 10:52 PM
Joined: Jan 2003
Posts: 28,063
Irving, TX
feets Offline
Senior Management
feets  Offline
Senior Management

Joined: Jan 2003
Posts: 28,063
Irving, TX
Quote:

One which will take the torque of a Cummings diesel.




You know better than that!





I ran a LOT of miles and did far more donuts, figure eights, and hang time in my 92 D250 Cummins than anybody ever expected and the transmission held up great for over 270,000 miles.
I finally had to take it out due to fluid bypassing in the OD section. None of the working parts were hurt. A few seals had let go.

8344909-clutches_2.JPG (34 downloads)

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
Re: Finally a BB automatic overdrive tranny! [Re: DaytonaTurbo] #1702083
11/28/14 10:56 PM
11/28/14 10:56 PM
Joined: Jan 2003
Posts: 28,063
Irving, TX
feets Offline
Senior Management
feets  Offline
Senior Management

Joined: Jan 2003
Posts: 28,063
Irving, TX
Quote:

And anyone who's owned one knows the ones even on stock unmodified Cummins are not known for their longevity. Not saying the 518s are bad, but they're not the holy grail either.





I'll strongly disagree with you on that.

The failures started happening when the lock up converters were used. The clutches in those converters would disintegrate. The trash would get into the system and the overdrive fluid passages would be the first to get plugged.
The failure wasn't in the transmission. It was in the converter.

Do these bits look like they have over 270,000 miles on them?


8344915-clutches_1.JPG (48 downloads)
Last edited by feets; 11/28/14 10:58 PM.

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
Re: Finally a BB automatic overdrive tranny! [Re: DaveRS23] #1702084
11/29/14 11:39 AM
11/29/14 11:39 AM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
DaytonaTurbo  Offline
Too Many Posts

Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
Quote:

I don't know of a more durable tranny than a well built 727 for most of what we all do. So, as far as the first 3 gears, a 518 would be as tough as any comparably built 727.

Now I don't know the limits of a lock-up converter or the OD section, but do those really need to hold all of our power in normal driving?

I plan to use a non lock-up 518 in the Cuda next year. The main body will be built just like the 727 in there now which has proven to be nearly indestructible. The OD will be beefed up, but I do not plan to ask it to hold all of power the engine is capable of making.




Someone correct me if I'm wrong, but it's my understanding that ALL engine power is transmitted through the OD clutch pack, whether OD is engaged or not.

Re: Finally a BB automatic overdrive tranny! [Re: feets] #1702085
11/29/14 11:41 AM
11/29/14 11:41 AM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
DaytonaTurbo  Offline
Too Many Posts

Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
Quote:

Quote:

And anyone who's owned one knows the ones even on stock unmodified Cummins are not known for their longevity. Not saying the 518s are bad, but they're not the holy grail either.





I'll strongly disagree with you on that.

The failures started happening when the lock up converters were used. The clutches in those converters would disintegrate. The trash would get into the system and the overdrive fluid passages would be the first to get plugged.
The failure wasn't in the transmission. It was in the converter.

Do these bits look like they have over 270,000 miles on them?






I can't attest to that, having never owned and earlier year model. However when looking at the later year ones, especially once the 24v came out and they started making a little more power, finding one with a trans that was not already on it's way out was a tough task. Best you could ask for is one that already had the trans done. And even then I don't recall anyone doing converters.

Re: Finally a BB automatic overdrive tranny! [Re: DaytonaTurbo] #1702086
11/29/14 05:00 PM
11/29/14 05:00 PM
Joined: May 2005
Posts: 4,681
Florida
BDW Offline
master
BDW  Offline
master

Joined: May 2005
Posts: 4,681
Florida
I sure hope it holds up, I'm not too hard on my rides.

Took mine out for the initial test drive, a few bugs to work out, but it is awesome.
Only 2800 rpm at 75mph, and no vibrations which was a concern. Now I can keep up with the rice burners on I-95 without rattling my teeth.
Here's a shot at 60mph, only 1800rpm and I have 3.73 gears.
Glad I got the LU converter, I can definitely feel it drop a few RPMs when it kicks on, it's like having a 4.5spd auto.


Re: Finally a BB automatic overdrive tranny! [Re: DaytonaTurbo] #1702087
11/29/14 06:52 PM
11/29/14 06:52 PM
Joined: Jan 2003
Posts: 28,063
Irving, TX
feets Offline
Senior Management
feets  Offline
Senior Management

Joined: Jan 2003
Posts: 28,063
Irving, TX
Quote:

Someone correct me if I'm wrong, but it's my understanding that ALL engine power is transmitted through the OD clutch pack, whether OD is engaged or not.





That is incorrect.

There are two clutch backs inside the OD housing. One for direct and one for OD. The direct pack is inside the hub and has pressure applied by an 800 lb spring. The OD clutches surround the hub.

The second photo I posted shows the two sets of clutches in the OD housing.

Here's a shot of all four sets out of my 270,000 mile D250.

8345758-clutches_0.JPG (50 downloads)
Last edited by feets; 11/29/14 06:56 PM.

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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