Th400 transmission rebuild - JeepForum.com

 
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post #1 of 8 Old 06-25-2013, 09:40 PM Thread Starter
NepaCJ7
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Th400 transmission rebuild

Currently the only problem with the transmission in the Jeep I am about to trade for is the pan gasket needs replacing as it leaks. At some point I would like to buy another th400 and completely rebuild it little by little then just swap them out when I swap out the engine. The current one is mated to a quadra-trac transfer case and the engine is a 304.

I plan on building a 360 from the block up, as well as rebuilding a th400 and then mating that with a t18 transfer case as I believe this will allow me to keep the axles stock.

Has anyone personally rebuilt a th400? Assuming there is not a time limit, what amount of time would be needed as well as a general cost if you have done so. I am talking about a complete gutting and replacement of anything that is worn. I realize that one can buy re-manufactured engines and transmissions but since this is basically a spare I want to do it myself. If no one has done this I can easily look up parts cost myself. I just thought I would see if anyone has done one themselves before I start gathering information.

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post #2 of 8 Old 06-26-2013, 12:28 AM
CSP
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They aren't that bad. Get yourself an ATSG repair manual (http://www.transmissionpartsusa.com/...als_s/3766.htm) and you'll need the right spring compressors. You might even check youtube for TH400 rebuilds as I've read that there are some good videos there.
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post #3 of 8 Old 06-26-2013, 05:05 AM
2Xtreme
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I've heard that they aren't that bad.
According to videos I've seen, it doesn't seem to be.

I plan to do mine, eventually.
Quote:
Originally Posted by NepaCJ7 View Post
I plan on building a 360 from the block up, as well as rebuilding a th400 and then mating that with a t18 transfer case as I believe this will allow me to keep the axles stock.
I assume you mean a Dana 18 Tcase?
The (Borg-Warner) T18 is a transmission.
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post #4 of 8 Old 06-26-2013, 11:51 PM Thread Starter
NepaCJ7
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You are correct, the Dana 18, I was reading an article talking about the t-18 and t-19 transmissions and it also referred to several different transfer cases and for whatever reason t-18 stuck in my head, hahahaha. I plan on doing a rebuild log on it once I get started, but will not post it until I am done so that weeks don't go buy between updates.

Thank you for the link to the manual, I greatly appreciate it and I would also like to say that in just a few days I have all ready received more information here than I have for my current non-jeep vehicle and the forum I belonged to for it for almost 2 years.
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post #5 of 8 Old 06-27-2013, 07:17 AM
2Xtreme
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Quote:
Originally Posted by NepaCJ7 View Post
...Thank you for the link to the manual, I greatly appreciate it and I would also like to say that in just a few days I have all ready received more information here than I have for my current non-jeep vehicle and the forum I belonged to for it for almost 2 years.
I have owned belonged to MANY car-related forums int he past and this forum and it's members are by far the best of any of them!

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post #6 of 8 Old 06-27-2013, 08:07 AM
lucdog
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If your close to central Illinois, and could drive here, I have a TH400 you can have, It was mated to a Q-trac, so a adapter related parts would be needed for the Dana 18.

Bill

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7
1989 YJ the CJ to YJ.
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post #7 of 8 Old 06-27-2013, 05:08 PM
fuzz401
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If you need a th-400 to rebuild I have one

1978 cj-7 had since 1979
401 .030 over- full floating flat top pistons
crower solid cam 292 dur .500/.510 lift
turbo 400 tranny 2500 stall
model 20 transfer case
aj delux glass body
4" lift
dana 30 frount
dana 44 rear
4.56 gears

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13.461 @ 92.45 mph on 37" super swampers on 1/4 mile
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post #8 of 8 Old 06-29-2013, 08:05 PM Thread Starter
NepaCJ7
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Lucdog, I am in Pennsylvania, about 100 miles west of nyc, there is a salvage yard with nothing but jeeps about 60 miles from me and they sell on ebay as well. I appreciate the offer on the transmissions though.

Fuzz401: You're about 3 hours from me, when I am ready and if the salvage yard doesn't have one at that time and you still have it I'll get back to you
about what you want to sell it for.

Last edited by NepaCJ7; 06-29-2013 at 08:27 PM.
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