Shadow, It sounds like your differential just needs adjusting. Take the CVD out of the right side of the differential, you will see the head of the differential bolt unless it is partialy hidden behind the plastic bolt cover, even if it is you will see a hole in which to insert your 5/64 allen wrench in. Tighten the bolt until the spring compresses fully, then back off 1/8 turn. if that doesn't do it you will need to disassemble the transmssion and check the condition of the differental drive rings and the 12 balls.....You can flip the drive rings one time before you have to replace them..