Uses 1350 u-joint. End of pinion yoke to u-joint center ("B") is 3-7/8". 2.187” diameter for computer pick up assembly. Manufactured from high strength heat treated 4340 steel. All machining is done in relationship to the spline pitch diameter to ensure each yoke is symmetrical for balance and smooth operation. Utilizes the 2nd generation alloy steel cap kit for added strength or standard u-bolts. - Sold separately. Weight 2.50#