I have a 1996 chevy z71 with the 5.7 auto trans not sure what kind of tranny it is though. But i bought this truck not too long ago and it ran fine. About 3 days ago my transmission started to not want to shift out of 1st gear. If i let off the gas it will shift but thats the only way it will. The truck has 194K and i just had the trans serviced today. Any ideas on this?

 

did it do it before the service or after?

 

Both. That's one reason i had it done.

 

id say if you had it serviced and it still does it after almost 200,000 miles its time for a fresh rebuild!!

 

How can i tell what tranny i have in my truck?

 

96 1/2 ton = 4L60E

 

Maybe a dumb question but did you check the fluid level?Are you missing another gear like reverse or 3rd.Could be burnt clutch packs or bad solinoids

 

Ditto.
If it's the original trans it's time for a re-build.

 

i have a 94 full size blazer that is doing something sumular. it stays in first but i can shift it into 2nd manualy. and the anti lock brake light comes on when it should shift into 2nd. any one think its a sumular reason. both problems started @ the same time

 

FIXED!!!!!!!!! i was able to clean the front sensors and replace the rear speed sensor ($165 dealer price) and she was back to normal