'95 4T60E parts compatible with '97 4T60E?

[logikfive]

Are the valve bodies compatible?

Reason I ask is because my '97 Lumina LTZ is still giving me headaches, and now it's throwing a SES when warmed up fully and driven 100 miles for P1870 which is tranny slip (TCC). I still have the original tranny from my '95 Lumina and it had no slipping problems. I wondered if it would swap in my '97 Lumina LTZ without a problem (getting rid of the SES) since that tranny has 100k less miles on it.

As long as the SES goes away for more than 300 miles, I'm happy (that way I can get it through NYS inspection) and if it goes after that I have a year to fix it.

Thanks!

[IsaacHayes]

There probably is less sensors in the 95 since it's ODBI, so it might work, but would probably give SES codes because it's missing data... I'm no expert, so it may work, but ODBII has the diagnostics for slipping that ODBI doesn't.

Also, my 94 4T60-E is vacuum modulated for line pressure, ODBII 97 might be electronically controled for line pressure.

[sharkey]

line pressure is controlled by the vacume modulator on all 4t60e transmissions, right up to 2000. the 4t65e has an epc solonoid to controll line pressure, those started 98+.

both the 95 and 97 tranny are the same nothing more added because of obd2. for some reason, i think the wiring is a bit different, but im not sure. try to find some diagrams for the case conector for 95 and 97, see if they are the same. if they are, your good to go, if not, just swap the wires in your harness.

[IsaacHayes]

Cool, good info! Not sure how ODBII detects slippage, but I know ODBI doesn't.

[sharkey]

its all in the programing. the pcm is programmed in such a way that when you are in X gear, your engine rpm will be Y at Z roadspeed. if your engine rpm is higher than the given range, it will set a gear ratio error code.

[IsaacHayes]

Ahh cool. I was thinking it may be simple as that, but wasn't sure.

[logikfive]

Thanks for the help guys. Would the case wires matter? Since I'm not swapping the whole tranny would it make a difference?

Also, is it possible to do the valve body on the tranny while in the car?

[sharkey]

are you planning on just swapping the valve body??? it is possible to do it in the car, but i wouldnt recomend it.

[logikfive]

Yes, that was the plan to swap only the valve body. Mostly because the car has just had a TON of work done to it and I really don't have the ambition to pull the tranny out of it. If I do that I might as well just replace the whole tranny with one that has fewer miles on it, as the car currently has 217,000 miles on it.

Thanks for the help!
Joe

[TurboGTU]

Good luck with the check balls.

[logikfive]

Well, it looks like I'll end up pulling the tranny, not by choice. Dangit.



Thanks for the help guys.

[tractorman]

If I understand right, that code won't set unless you get up to highway speed, right? If that's the case, you could stop somewhere close to the inspection place, unplug the battery for a while to reset the codes, and drive slowly to the inspection place so the code doesn't get set again. Problem solved (in a sense).

[logikfive]

I don't recall exactly, but I've been told (friends with the inspectors) that the system will be tripped if the computer is reset. So it would fail anyway. I dunno how true it is, but either way it not only hurts the tranny the way it is, but it causes the engine to get up to abnormally high temperatures. Having 217,000 miles, I don't particularly like putting any more stress on the thing than it needs.

[tractorman]

Sounds reasonable to me... but I don't see how they could detect recently erased codes- maybe they can, but I've never heard of it.

I've cheated emissions tests and the like more than once... you just gotta get creative.