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3at auto shifts at 4000 rpm
Posted 01 December 2004 - 07:22 PM
still dinkin with the 83 coupe tranny.
will shift into all gears but not till you wind it up to 4000 rpms.
have tried 3 known good modulator valves and have tried adjusting them. have tried 2 known good governor assemblies that have worked fine in other transmissions. the gov that came out of the car was not apple cored or anything.
all govs and mods act the same... 4000 rpm shift point.
fluid is full and good.
am i missing something obvious here?
any replies are welcome. thank you.
Posted 01 December 2004 - 07:53 PM
Is there more fluid in the differential than there should be...Ie...exchanging fluids?
Vac lines messed up so its not getting a vac signal at the right time so it doesnt know to shift?
Hey is that my old 83 GL 2wd coupe? The white one??
Posted 01 December 2004 - 08:03 PM
yup- thats your old white coupe Shawn. funny how these rigs get around... kinda like some of your best friends girlfriends when i was a young lad.
she lives again. everything works, and ready to roll. except for the nagging tranny problem. i want to exhaust all the options before pulling it out and putting in a 5spd...
thanks for the replies.
Posted 01 December 2004 - 08:45 PM
Doubt if your 3AT has a filter. Mine don't, just a screen. After I cooked my fluid, I pulled of the valve body and found a lot of black particulates all through the valving.
Might also be pump pressure issues. Any difference hot or cold?
Posted 01 December 2004 - 09:28 PM
Another option would be to obtain a pressure gauge, and attach it to the proper port on the transmission (I don't know which one, but you can get an ATSG book for it for about $15, the transmission is an M41) and monitor the modulator pressure, should be ~20-40 psi with full vacuum applied, and increase to 140 or so with no vacuum. If you can monitor the line pressure as well, it should rise with the modulator pressure, although it doesn't rise as much, maybe 20 PSI.
I don't have exact figures because I don't have an ATSG manual in front of me...
Posted 02 December 2004 - 12:48 PM
Posted 02 December 2004 - 04:39 PM
yea jwx, 4000 rpm powershifts are fun, till the dang thing blows her cookies!
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