I broke the ring gear in the 8-3/4 rear end(489 case)this was a 410 gear and had many street miles and some 10 second passes on it as well as the 12 second passes this last weekend.The car has a spool and is a small block(360,904 combo)and is 3000lbs.My question is should I just get a set of gears and go or should I change to a 742 case?The car has 35 sline axels in it as well.