There is a bad clunk sound in the rear of my truck whenever i am making a slow trun, or u-turn. my buddy said that it could be the barkes grabbing or it is the spider gears. The sound will go away as soon as i speed up and drive away. i just replaced the differental fluid like 3 days ago so i know thats good. if it is the rear does anyone know where i can get one from like a junk yard or something. i live in maryland so if there is anything kinda close that would help alot. thanks for the help

Did the problem start after replacing the diff fluid? If you have POSI, then you need to add the POSI additive; otherwise, the clutches (for the POSI) will make noise with sharp turns.

//2000CAYukon

no the noise started before i replaced the fluid. a friend of mine said that he had the same problem and jsut had to change the fluid. yes i know i have to add that additive but i used amsoil 75w 140 and i heard that amsoil already has it in there. but i could be wrong. when i replaced the fluid i didnt notice any large chunks out of any of the gears. there was just the normal shavings stuck to the maget at the bottem. thanks for the help

I put Mobil 1 75-90 in my Impala SS when I first got it. Did not add the additive. Noise started a few days later on tight turns. Added a bottle of GM additive and I have not heard another noise out of it.

//2000CAYukon

ok i will try that thanks for the help