Weird Issue
 

Hey Guys first time here,

Im having an issue i haven't been able to pin point. Here whats happening. Truck is a 1999 chev 1500 v8 5.3

I am hearing almost a whining or squeak coming from the rear of the truck. Now this is not constant but quick squeaks. It seems to happen 70% of the time im moving forward (never reverse) and usually stops once i get going over 30 km. Sooo i was thinking drive shaft just because the squeak only happens with the throttle on!. Not thinking dirt in brake pads or anything like that either.

Thoughts? Its annoying me lol.

Check u-joints.