Thanks for all of your help!! I opened up the r.diff. and the pinion and ring looked ok, and because im a novice, i didnt want to open up the rest untill I found out for sure thats it. do the front and read diffs. work the same? if you lift the rear end and push the front wheels forword, should both rear wheels spin, or just the left? my dad thinks its fine and working good because when one rear wheel is spun forword, the other spins back and so on. I really do appretiate your help though!!
-Brian