I have a dodge ram 1500 4x4 quadcab the rear end is howling and making noises when i am on and off the throttle

The problem is almost always caused by the clips that hold the clutch disc in place on the po-si rear-ends.The clip will come lose and catch between the carrier clamp and cause metal parts to be deposited in the housing causing the front and rear pinion bearing to wear. Howling while accelerating is the rear pinion bearing. Howling while decelerating is the front pinion bearing. Sometimes you can get by with just replacing the clips and pinion bearings. Clips can be ordered out of California. For around $70.00 .The dealer will want to sell the entire assembly. Which does not include the pinion and bearings. The longer you go the more damage that will be done. If you can't do this yourself. No one is going to repair just part of the assembly and warranty.