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Old 01-03-2010, 09:41 PM
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Dang. I also see that I don't have the auxillary valve body on this transmission. Should have changed the title of this thread to "What year is this transmission?" And since I didn't even know what I'm looking at until I read about it here or in the manual, I'm not quite sure what to do with this core I have on my hands. It doesn't really match my rebuild kit. And I think its prudent to have the later model improved parts that GM installed. I need a strong transmission for this project. I basically have an early 87 trans housed in a 1991 case.

So should I hunt around for a new core that really has the later model internals?

Or is it pretty straightforward to add the good later model parts to this older core. I see that this is starting to add alot of cost to my otherwise budget transmisison build.

If I decide to upgarde all the weaker internal parts I need to know whats necessary to track down. Here is a list I came up with. This is just me going through the ATSG guide. Can you guys let me know if this is close to the right list of upgrade parts?

1. Need 88+ wider center support for low reverse roller clutch. ($20, on the way)
2. Need 88+ valve body
3. Need 88+ auxillary valve body.
4. Need 88+ reverse input drum and piston. ($99 new?
5. Need 88+ pump ???? Maybe? I have a late model stator shaft in the rebuild kit. Does swapping this bring the pump up to date?
6. Need some selective shims to make all these assembled parts and clutches work right and have correct spacing..

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Old 01-04-2010, 05:00 AM
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Get one 1988 and up.

Easy to spot.

Look for the "rainbow" casting flash on the passenger side.
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Old 01-04-2010, 06:29 AM
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this makes me wonder what numbers on what tag of this trnas you were reading. In your first post , you indicated that the trans was a 1991 vette unit and the numbers match that idea.

It would be good to know what to look for correctly on the next core to avoid another older unit. I've seen some 1991 - 92 -93 trans cases without the rainbow cast line on them

I would suggest another -newer core. the valve body calibrations are better - easier to work with on the 1988 - 1992 units..
Dont worry how old you are... it is the mileage on your body that adds up.
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