I am thinking of buying a lightweight driveshaft from JPC. From what I understand the shaft uses the factory pinoin yoke and it is a direct replacement. There are others on the market but they require disassembling the rearend to install a traditional pinoin yoke. I have heard nothing but positive remarks on this mod. I believe that the factory driveshaft is approx. 50 lbs. and the JPC shaft is 17 lbs. This is a loss of 33 lbs of weight, not to mention the loss in rotational mass.