When I shift into gear The rear end cluncks like it has lots of play. Also when I go around corners at lower speeds the rear end moans like there are two pieces of meatle rubbing together. It is a 2000 silverado with a posi track rear end.
I would suggest a rear differential service. When the fluid breaks down in the rear it doesn't provide the proper lubrication for the rear and you'll hear the "moan". Don't forget to buy and add the limited slip(posi-trac) additive.
As far as the rear end noise, There was a TSB released on GMC light duty trucks that says
"Some owners of light duty trucks equipped with automatic transmissions may comment that the vehicle exhibits a clunk noise when ******* between Park and Drive, Park and Reverse, or Drive and Reverse... Whenever there are two or more gears interactin with one another, there must be a certain amount of clearance between those gears in order for the gears to operate properly. This clearance of freeplay (also known as lash) can translate into a clunk noise whenever the gear is loaded and unloaded quickly, or whenever the direction of rotation is reversed."
It goes onto say "...Whilse some owners may find the clunk objectionable, this will not adversely affect durability or performance."
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