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Old 07-21-2002, 04:57 PM
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Post gm125c trans

I'm rebuilding a GM125C trans in a'85 cavalier (considering doing my '84
caravan also) but several tools I may need(?) are prohibitively
expensive. As a retired machinist I can make what I need, but need the
dimensions. If anyone has done one of these, do you really need the
special tools? The ones I think I need are the "J" numbers are from my
ATSG TECHTRAN Manual and the "T" numbers are I believe ATEC numbers
(Fron TRANSTAR catalog)J-29829-1,J-29829-2/T1274-A Turbine Shaft Seal
Installer/Resizer Case Side; J-29569-1,J-29569-2/T1274 Turbine Shaft
Seal Installer/Resizer cover side; J-28545/T1202-A Clutch Assm & Final
Drive Remover & Installer; J-28542/T1059-B Lo-Reverse Clutch Center
Support Unit Remover & Installer. Does anyone have or know where I can
get the machining dimensions to make something that would do the job.
<img src="confused.gif" border="0">

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  #2 (permalink)  
Old 07-22-2002, 10:15 PM's Avatar Moderator
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You may be buying more trouble than you need. I have rebuilt a '56 Hydramatic (many tinmes!), a Turbo 200, a Turbo 350, a turbo 400, a Turbo 7004R and am now working on a Turbo 200R4 and have never needed a special tool that I couldn't make with a cutting torch, grinder and other hand tools. And precious few of those at that. As far as I can tell, those specialty tools are great if you need to do 6 or 7 trannys in a day because you are being paid by the piece, but if you are doing the job for yourself, they can be worked around. With a good set of internal and external snap ring pliers, seal lip tool (small spatula to ease the lip seals into their bores),sockets, hydraulic press and a few other basic tools you should be able to muddle thru just fine. Just get a good instruction manual.
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Old 07-23-2002, 03:58 AM
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Thanks Willys36! I kind of figured I'd be able to do it without special tools.
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