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Old 04-11-2012, 04:26 PM   #1 (permalink)
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Turbo 400 and BW 901?

Im thinking about putting an automatic behind the 401 in my 84 cj7. There is a guy locally who has a turbo 400 with a Borg warner 901 transfer case out of a cherokee. My question is: Is this combo something that would work in the cj7 without much trouble? Thanks
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Old 04-12-2012, 05:41 AM   #2 (permalink)
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Do you mean a TH400 and BW1339 (aka, quadratrac)?
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Old 04-12-2012, 06:30 AM   #3 (permalink)
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Yes, found out its a quadratract t-case, not good, thanks
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Old 04-12-2012, 06:52 AM   #4 (permalink)
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Quote:
Originally Posted by flhayden View Post
Yes, found out its a quadratract t-case, not good, thanks
If you are not going bigger than 35's and you skid plate it well, the quadratrac isn't a bad case at all.

But that also doesn't mean you should swap it in. Just that people bag on them wrongly and in total ignorance, they believe whatever the magazines tell them.
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Old 04-14-2012, 07:09 AM   #5 (permalink)
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The bitch with a Q-track is that the drive chain stretches and skips, especially with the higher power 401 and a heavy Jeep. A Chi-com replacement chain may last a year. An original USA "Morse" chain may last 30-40k miles. The q-track also takes special oil, if you still have the original posi center diff in it.

Swapping it into a '84 CJ means you would need to replace the rear axle, the offset is to the right, not centered for the rear drive. earlier CJ-7 offset AMC 20's are available, but only in a narrow trac width. The offset Dana 44 from the SJ would fit, but would need new spring mounts and the shafts redrilled to 5 lug. Some people use the q-trac anyways, with the original centered rear axle, but driveline angles would suck on a CJ-7. The stock TH400-401 flex plate also sucks, compared to the 727 flexplate, it's very prone to cracking accross the three webs.

Maybe you could use the TH400 but install an adapter for the original Dana 300 t-case? Advance Adapters and Novak make them.

Other options:
A 32RH/998 torqueflite from a CJ, TJ or YJ will bolt to the 401 using a '72-'74 AMC car 401 727 flexplate, and the dana 300 will bolt directly to it. Same length as a T4 T5 or T18 swap. All stock mounts would work, and it would bolt to your existing skid plate in the same location as the manual trans. same driveshafts, too. The trans can be beefed with 999 or 44RE internals to handle the 401's power. It's lighter and shorter than a TH400, and uses less power to drive, and has a lower first gear ratio.

A '80-'91 SJ 727 can be used, but you have to contend with the bump out on the larger trans pan, it can interfere with the driveshaft on a Dana 300 in a CJ. If you have 4" or more lift, this may not be a problem. Also, if you have an Atlas t-case, the driveshaft is farther out from the case, and it may clear fiine. The SJ 727 is just as strong as a TH400 (IMHO), but shorter and bolts directly to the Dana 300, no adapter needed. Same gear ratios as a TH400, too.

Chebbie TH-700R4, etc can be swapped in, but I haven't had good luck with the Chevy trans to AMC engine adapter kits. They use converter spacers that need longer bolts, (they come loose), starter alignment (Noisy) and the lower part of the torque converter opening is hard to seal, in my experience.
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Old 04-14-2012, 08:23 AM   #6 (permalink)
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Personally, I love the q-trac. I just sold mine that I had in my 79' CJ7 360, TH400, 35s, offset 20 with one pc axles, lockers, etc. It was probably my favorite all around jeep I ever had. Not a hardcore wheeler by any means, but it worked on most trails we took it on, they work better than any other jeep I have ever driven in the snow. They just work well. You should consider using it if it is going to be a mild dual purpose (I did use it on black trails). The only reason I sold mine was I am building only TJs and YJs in my shop now and money does not allow for me to keep everything.

You can also use the TH400 with the output gear from a commando automatic and use a dana 20 transfer case.
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Last edited by sixshooter; 04-14-2012 at 08:24 AM.
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