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Old 05-14-2004, 03:45 PM
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4t80e Cadillac Transmission Problems?

I RECENTLY PURCHASED A 1995 AURORA OFF OF EBAY MAINLY FOR THE DRIVETRAIN. I WOULD LIEKT O USE THE NORTHSTAR V8 FRONT SUBFRAME AND THE 4T80E TRANSMISSION ON MY 41 CHEVY COUPE PROJECT.

THE CAR CURRENTLY HAS TRANMISSION ISSUES. IT WILL NTO SHIFT INTO OVERDRIVE. I AM THROUGHLY CONVINCED THAT THIS IS AN ELECTRICAL RELATED PROBLEM.

THE TRANSMISSION MOUNT HAS BEEN REPLACED. THE CAR WAS HOOKED UP TO A SNAP ON COMPUTER AND THREW OUT 2 TROUBLE CODES SAYING TO REPLACE SHIFT SOLENOID IN TRANNY. THEY HAVE BEEN REPLACED BUT THE PROBLEM IS NOT FIXED. FLUID LOKOS GOOD EVERYTHING IS CLEAN NO METAL SHAVINGS NO BURNT FLUID. CAR SHIFTS HARD WHEN YOU PUT IT INTO DRIVE THEN DRIVES EPRFECT THRU ALL 3 GEARS BUT DOES NTO GO INTO OVERDRIVE.

SOMETHING ABOUT TORQUE MANAGMENT DISABLED. ANYWAYS IM AT A DEAD END. ANYONE FAMILIAR WITH THESE TRANNYS CAN OFFER ME ANY TIPS OR ADVICE?

THANK YOU

JOHN

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Old 05-14-2004, 08:45 PM
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4t80e

what are the codes obd or p o codes the codes are the key here
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Old 05-14-2004, 09:32 PM
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OBD 2

There is a problem with the transmission. It is turning on the service engine soon light and displaying a shift solenoid trouble code numbers 86 and 94. There are no metal filings in transmission pan and the fluid is not burnt. Car shifts into drive hard and does not shift into overdrive.
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Old 05-18-2004, 06:55 PM
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anyone?
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Old 05-18-2004, 08:40 PM
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have you cleared the codes?

Have you checked the wire harness?

Do the same codes come back?

Have you hooked a pressure guage to the transaxle? Harsh engagement is an indication of high main line pressure. This will also show if the pressure control system is working.

Is the speed-O operating correctly?

Is there any codes for the TPS? A faulty TPS can cause problems with shifts

regarding the torque management , it is part of the main programing. it is listed under emissions by GM , so it is protected by federal laws. It can be reduced, not fully removed per law
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Old 05-18-2004, 08:45 PM
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cleared the codes check engine ligth went off

as soon as i shifted it into drive engine light popped back on

it is buildig up too much pressure in the system

something about torque management being disabled

once moving it shifts perfect through first three gears but at 65 mph im running about 2600 rpm

wont kick into overdrive

speedo works perfectly

does this help? do you have any more ideas?

what should i do next?
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Old 05-18-2004, 08:51 PM
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regarding the torque management , it is part of the main programing. it is listed under emissions by GM , so it is protected by federal laws. It can be reduced, not fully removed per law


perhaps i mis understand your comment
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Old 08-14-2005, 08:25 AM
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4t80e

Got just about the same problem. I do get into 4th but with a lot of slip. 1st 2nd and 3rd work fine. Get code 86 if I let it go into 4th. Only thing I can find is shift pressure goes way up and stays there until I stop. It then goes back to normal. Everything worked fine until I had the valve body taken out and put back in . Anyone know what the shift pressure should be, I get around 10 normal and 30 when it goes into 4th gear? Looks like GM is trying to go out of business with the 4T80E.

Last edited by Billy Malone; 08-16-2005 at 03:23 PM. Reason: More info
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Old 05-12-2008, 09:15 PM
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4t80e cadillac transmission problems?

Quote:
Originally Posted by mile-hightoyz
cleared the codes check engine ligth went off

as soon as i shifted it into drive engine light popped back on

it is buildig up too much pressure in the system

something about torque management being disabled

once moving it shifts perfect through first three gears but at 65 mph im running about 2600 rpm

wont kick into overdrive

speedo works perfectly

does this help? do you have any more ideas?

what should i do next?
can you manually overide the trans and make it shift through the controller?If you can its external maybe pcm wont allow 4th some peramiters need relearning when battery is disconnected also pcm wont alow relearn until all codes are cleared.
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