on the slp take-off differential units what does this mean?? also if i am changing from a stock 2:73 rear-end to this unit what will i need?? i want a posi rear with 3:42 that are capable of handling around 300-330 horsepower?? thanks guys

 

GM creates ring and pinion gears in roughly the same thicknesses. The deeper you go in gear ratios the thicker the gear needs to be. Instead of making a real thick gear they simply move the thickness of the carrier over to compensate. If you used a series 2 set of gear on a series 3 carrier, they would either have too much clearance between the ring and pinion or then wouldn't mesh at all.

The 10 bolt changes carriers at 3.08 gears. 3.08 and beloc are 2 series. 3.23 and higher are 3 series. You can buy extra thick 3 series gears to fit in a 2 series carrier.

When I still ran a 10 bolt I was putting close to 500 hp through Motive 4.10 gears. The weak link in a 7.5" 10 bolt is still the tiny ring and pinion. The teeth are very small and the deeper you go in gear, the smaller the teeth get.