Hi,
I have a 1994 Chevy Silverado 5.7 AT 4x4. When I start moving from a complete stop, I hear a "BANG" coming from the back of the truck. As if something was in the bed of the truck and hit the tailgate as I start moving. But there is nothing in the bed and there is no spare tire under the truck. Is this an indication that the rear is going bad? I don't know if this is relevant, but sometimes when the truck is coasting and you lightly step on the gas, the truck will buck & clank until you give it more gas or take your foot off the gas. It did this last summer and I put in a used tranny, but it still does it. Can this be an engine or a trans problem, or maybe the rear?? Does anyone know of any known problems with the Silverado or what could be wrong?
Thanks for the help!

 

Has the rear differential ever been serviced, service recently? How about U-joints

 

If you have the G80 ( gov lock ) option its probably going bad mine did this and finally it went , if it pops or bangs going around sharp corners this is a dead giveaway , mines now sitting in the drive while I look for parts , also if you have the 2 piece drive shaft the slider section might be out of grease .

 

Yes, we call them gov bombs because they make a mess. The best thing to do if it is the rear end is to replace the gov lock with a open face carrier with regular spider gears in it. That's what I do and tech around the world suggest and they work great.