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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-08-2005, 11:27 AM   #11
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There might be one ratio... This is something I would have to look into... But I don't think that we will only have one final drive ratio... I think there are 2 final drive ratios, and the ratios can be changed with a diffrence in sprocket size( chain drive )... Might have to look that up when I have more time...

A shop that does business like that is the worst shop ever...

I feel that a shop that is truthful in the longrun will have better success simply to good word of mouth...

And I don'y care what that punk said.... GX3 is the 3.33 tranny for the 89-91 Bonnies... 87-88 used the 2.73, 2.84 or 2.97( SSE or LE,SE with the handling package if memory serves )

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Old 05-08-2005, 12:02 PM   #12
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To me there are three kinds of transmission work for these cars, what I can do myself, replacement from a yard (provided I can examine the car it came from), and replacement with a factory remanufactured transmission. In the case of an 87-89, the remaned trans is brought up to the latest specs for the 4T60 (and there were a *lot* of slipstreamed improvements - just read the TSBs).

AT work is a specialty unto itself and requires special tools to go deep inside. While I have rebuilt a blown manual trans on the back of a trailer, automatics are a different breed and given the difficulty of R&R, would prefer to know it is right before it goes in.

BTW I see several more 4T60 ratios, in all : 2.73(FP3), 2.84 (F17), 2.93 (GW9), 2.97(F79), 3.06 (FW2), 3.33(GX3).

BTW2 if you want a 3.33, just look for a Grand Prix or 6000 or equivalent Chevvy, etc. with 2.8l engine and o/d trans..
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Old 05-08-2005, 12:08 PM   #13
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Padgett,

I will say this, it does take a special person to rebuild the FWD trannies or any auto trans for that matter... I have seen several THM440-T4'* and 4T60'* that were just as bad after the rebuild as they were when they went in... I have even seen a few that were total failures...

But so far all of the Hydramatic SRTA trannies that we have found over the years have been awsome... Strong, great positive shifts... All of the TSB updates really did make the Factory Reman a nice unit...

I have however seen a few 440-T4'* that were rebuilt and whoever did the rebuild did an awsome job... Hard to find someone that really knows how to build the correctly( experience would be the name of the game I guess )...lol

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Old 05-08-2005, 12:12 PM   #14
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I agree completely. I've rebuilt manual transmissions, as well as RWD automatics. The front drive transaxle (auto) is black magic. I wouldn't even think of attempting it myself. Change a diff or a TC? Maybe. But not a full rebuild.
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Old 05-08-2005, 12:15 PM   #15
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Quote:
Originally Posted by willwren
I agree completely. I've rebuilt manual transmissions, as well as RWD automatics. The front drive transaxle (auto) is black magic. I wouldn't even think of attempting it myself. Change a diff or a TC? Maybe. But not a full rebuild.
Bill I'm sure we could figure it all out after several failed attempts

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Old 05-08-2005, 04:52 PM   #16
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What I would really like is to take a blown one, and disassemble it without worries of putting it back together successfully. But just taking it apart, and seeing if I can put it back together. Possibly throwing it in my car and see if it would work [If I had the extra cash, I would try to rebuild it].

IMO, the cost spent on rebuilding your tranny, which the likelihood of it working properly afterwards are slim, you could buy a used one with low miles. Or for a little more, like padget said, buy a new one from GM.


-justin
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Old 05-08-2005, 07:35 PM   #17
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Yes rebuilding one of these tranny'* is very time consuming. I did mine on my first try, with the help of my boss, and even he got stuck in places. He can do TH-350 rear drives in his sleep but these are a bear. Mine came out pretty good i think but the best route is to look around and find a used one that'* in good shape or get a GM rebuilt unit that has all the available updates.
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