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Old 07-21-2021, 02:08 PM   #11
Honest Bob
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Join Date: Jan 2017
Location: Easton PA
Posts: 145
Re: need some help 4l80e experts

You need to check that the dipstick is actually reading correctly. You may be low on fluid and not even know it.

This video steps you through the process of calibrating your dipstick.

What ecu are you using? If the ecu originally controlled a 4l60e its not going to work right on a 4l80e. Its also possible if you sent it out to have the ecu tuned that it might not be tuned correctly.

The trans connector can sometimes be positioned upside down. Try unplugging rotating and reinstalling it.

Jack up the truck put it in neutral and see if the wheels can spin freely. Maybe something is locked up causing the truck not to move.
1975 GMC C35 - Junk yard survivor.
1986 M1009
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