I figure I have to buy another one anyway why not give it a shot. Are there any web pages that tell what to do or show a blow up of an 4t60 trans. It is the trans behind the 3800. any help appreciated.

i dont think they are going to offer specific directions or have a book on how to rebuild that transmission.. especialy because dealers just swap transmissions they never bother fixing them.. and how complicated is it to build a automatic transmission.. very.. if u goto your local gibraltor they normally have a transmission with half a bell housing.. normally a 700r4 and you can see how many companants there are.. i would only imagine a front wheel drive transmission being even more complicated

Doing an automatic isn't too bad IF you have a good shop manual. There are a multitude of parts and everything needs to be spotlessly clean, but it's really not all that much different from doing an engine overhaul. Rebuild kits are generally available for under $200 and include all the seals and clutch plates. The Haynse books don't cover the transmission at all, so a good factory book is needed. If you are not real comfortable doing major mechanical work, I'd recommend doing your first one with someone who has done them before.

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Rod Schneider, Woodstock, Ga.
White 88 GT

You can just go thru and replace whatever is worn but that doesn't mean the thing will work any better when it goes back together.

With a 4T60 you'll probably have to adjust the new modulator and the TV cable. This requires a pressure gauge and specific steps to do right. If it's off the tranny won't shift right and could wear the new parts quickly.

Having done a few transmissions... Mostly the "simple" C4 Ford... I never thought they were teribly hard but it is a bit tedious.

There are allot of details. Like parts that may fit more than one way but only one is right. (and not always obvious.) There are also various parts that are easy to damage, like some seals.

You'll want plenty of space.... When I used to do the fords, I kept a clean 4x8 sheet of plywood so I had plenty of clean area to lay all the parts out on. If you are going to leave it lay for any amount of time... cover it.

You'll need at least 1 Torque wrench. Probably two. Transmissions have allot of stuff torqued in the inch/pound ranges. I/P torque wrenches can be a bit hard to find.

Unless you want trouble everything has to be kept as clean as posible. If you trap dirt in any thing while assembling stuff you get a leak or a blockage really easy. (If you trap anything in the valve body you'll have a real mess. You can even ruin the valve body.)

You have got to have the books for TH125c and 4T60. You should also have access to the TSB library for them. There are allot of issues/changes to those units and many are only covered in the TSBs. The TSBs tell you stuff to look for that is prone to cracks or even breaking.

I think you can order the actual GM book direct from Helm. I think Transmission exchange co (listed in my cave) has books but I do not know how complete they are. The TSBs you can get thru alldata.

Parts are easy... Parts you can get from allot of places. There are at least two sources in various cave articles.

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11-Sept-01, The day the world as we knew it ended.

[This message has been edited by theogre (edited 01-28-2003).]

I've rebuilt one auto tranny in my life. It was a turbo 350, supposedly one of the easiest to rebuild. Well, amazingly it worked!!!!! I'll never rebuild an auto tranny again.......why? I'm batting 1000, why mess up my average.

The 4T60 is like rebuilding 3 turbo 350's at once. Oh, and did I mention that you need alot of special tools to rebuild an auto tranny. This is not a job for amateurs. Hell, it's not a job for guys like me with 25 years experience unless the experience is with auto trannys.

Please........let a pro rebuild it.....you'll thank me.

Phil

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trannys and tranaxles are not hard with a book and the tools you need. i rebuild about 6 tranaxles and 4 or 5 trannys. not hard mostly 8 to 16 hour job. i think its fun and i rebuild a tran before and engine i find that trannys are easier. you do not have to drill out all those dang valve guides and cut valves and bore the block. i hated learn all that crap. i say go for it!! just get the tool and books and do it all in a day or two.

now I don't know what to do. Mabye I will try and rebuild it just for kicks and get a low mileage one from a junkyard to use in the meantime. Thanks for the help though.

Do it man! Go to the best local dedicated transmission parts store, who should be able to provide you with update and rebuild manuals like the ones I have for around $15 each for the transmission you are working on. Take your time, keep it clean, take pictures if you can, keep bolts in the original places, and lay parts out in the order and position they were removed. Clean and dry the case, then start the assembly cleaning the part and then replacing the old pieces on that particular part such as seals and clutches and then reinstalling it in the case. That way you install the new parts in the same position and orientation as the old, especially the seals. If the input shaft has seamless pump seals instead of the split ones do not remove them unless you have the correct tool to reinstall them,or they will not work, because they must be pressed into the groove. Don't be afraid to use vaseline when installing the parts with seals into their perspective drums, use lots on the input shaft so the pump slides on without much difficulty, you must be careful here. If you are building a transmission that has failed, I would go through the valve body also. I have built five automatics with no formal training, just books and nerve. It's more time consuming than difficult to me.

www.bulkparts.com
Parts are CHEEP here. The manual they sell for the transmission is indespensible. Good luck.

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"How do I get one of those Smileys that rolls back and forth accross the screen?" -Archie

U will need special tools for the job and the manual. Its not an easy stuff but not impossible.

DreX