I just did an SLP Zexel Torsen limited slip and upgraded to 28 spline axles(had 26). The axles were $210 from Toms Differentials and they have thicker flanges and thicker main body. The Limited slip works very well. It uses two gears on the axles and "twizler" gearson top of them. It is curently $99 at SLP. Normally $299.