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Old 03-18-2004, 01:58 PM
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4L60E trouble with overdrive

I have a 94 gmc truck with a 4L60E tranny when I get up to speed I let off of the gas to hold that speed my transmission comes out of overdrive back to 3rd gear If I give it a little gas it will go back into overdrive. The same thing happens over and over again in and out of overdrive.
If I stay on the gas it will stay in overdrive. I took the transmission out rebuilt it put a billet servo, 13 vane front pump, heavy duty torque converter, and a basic rebuild kit new seals clutchs plates band and even took the valve body down. I can not find any thing wrong. Please Help

Tried changing the valve body with all of the electronics from a working transmission and it did the same thing, even tried by pulling the trans and installing another torque converter and this did not help, after it warms up the problem seems to be worse, any one have any other things I can try. Please help.

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Last edited by Please Help; 03-21-2004 at 12:06 PM.
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Old 03-18-2004, 07:52 PM
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4l60E trouble

first thing , you need to use a scanner to see if tranny computer is commanding tranny to fall or down shift from 4th to 3rd
my guess would be one of two things tps trouble number 1
shift solenoids number 2
now without my esp working thats only a guess

are you sure its not the lockup clutch in the converter
you notice in relation to rpm change????
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Old 03-19-2004, 07:20 AM
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As airworld points out , the first thing you hook to a vehicle with an electronic tranny is a scanner. Unless the parts breakage is obvious.

A quality scanner can almost make the tranny dance to help diagnose a problem.


I just diagnosed a "junk " 4L80E ( Per another shop ) ,,, that was droping out of OD after 5-10 miles ..

We forced the L80E into over drive with the scanner at low speed. I stood on the throttle and the tranny down shifted. An indication of a shift solenoid problem. New electronics fixed the tranny.
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