Truck drives forward but will not reverse . The truck has a new transmission every thing was working fine but now i can not back up the truck is a 2000 GMC 4 wheel drive

When is last time you changed trans fluid and filter?

Some vehicles were programmed to delay gear shift in order to acquire optimum coolant temp as fast as possible.

Sorry to tell you this. You have an AXOD/AX4N Transmission and it is going bad on you. Soon, it is going to strand you on the road.

This Transmission is a Money Maker for the Mechanics and Transmission shops around the world.

Some people will put Lucas into their transmissions to extend the life of the Transmission but there are people who do that and cause it do DIE!!!! and I mean Immediately.

I am sorry to give you the bad news but at least it is Honest...
P

Failed Transmission Again

Part with it

Get something else

Maybe American (Rear Wheel Drive Only)

You can try shifting into manual 1 to get moving then once you get going shift the lever up into Drive. This should work, then drive it to a shop to have your ****** looked at.

Your transmission is bad. You need to replace it soon if you are still driving it. At any moment you may lose forward and only have reverse (trust me it happened to me and I was dumb enough to drive it seven blocks back home in reverse).

An automatic transmission consists of a series of bands (gears) which is each gear within the transmission. You state that truck will move in reverse, but not in drive. The loud pop you heard was the forward gear band breaking. From this point you have two options...either have the transmission rebuilt or replaced.

pray for a no trany burn

The transmission has gone bad and all I can say is that you need to replace it.

Good luck.

you will need a new trans soon