most likely so in the tranny...u c in the tranny there r lil very thin spacers and they have a tendency to wear out rather quickly...so if u were to take apart the tranny im sure u will find one that is buggered up, some guys have had very good luck with this diff and there r some that have had nothing but probs...best scenario that ive came up with is build a ball diff this is what i did...u will have to get a whole new diff case tho...the ones for the t4/b4, u can use this case on the sc10 t-plate but u cannot use the gear diff on the other t-plate...just FYI hope this helps