Uses 1350 u-joint. End of pinion yoke to u-joint center ("B") is 3-7/8". Seal diameter is 2-1/8" then a 2.187” diameter for computer pick up assembly. Produced from 7075 aluminum and finished with exclusive MW gold coating process. 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.