Have 1995 gmc with a 4L80E TRANNY IN MY 4X4 wont

It does this only first to second or every gear change ? Hot or cold ?

sounds like a bad ground connection.. find and secure all you can and reboot...good luck

is it a 4l80e electronic shift transmission....it may be an issue with the solenoid pack...you can take it to someone who has a scanner tool for the trans...if it is indeed a 4l80e

I assume you've checked the tranny fluid level? If so check the vacuum lines on the tranny, I had one come off and it would not shift properly.

your getting waer or antifreeze into the tranny,you need too either put an aux cooler on it or replace the raidator!!!!
then change the tranny fluid again also drain the tourq converter!!!!
try this before you rebuild the tranny!!!!

rebuild gearbox bruv its knackered

no power stuck in 3rd gear electric shop unless youve burnt it up good luck...www.TransmissionGarage.com

SOUNDS LIKE SHIFTING SOLENOIDS ON VALVE BODY INSIDE TRANNY OR IT COULD BE BUFFER THAT COMUICATES WITH TRANNY OR OBC BEST TO LET TRANNY GUYS HAVE A LOOK @ THIS ONE RATHER THAN SPEND A LOT OF MONEY WITH LITTLE RESULTS

is the tranny a 4l60e or 4l80e. it may be major internal tranny problems

I own a shop, and think you should have a 4L-60 in it. These look just like a 700 R-4, but aren't. There isn't much difference in them, but according to my books it should have the 4l60, but some were 4l80. The 4l80 was mostly for the diesel engines though. Glad to help out, Good Luck!!!