30 spline, for 1350 series U joint. "B"= 2-7/8"Manufactured from high strength heat treated 4340 steel.Machining is done in relationship to the spline in the yoke to assure each yoke is symmetrical for balance and smooth operation.Proudly made in the USA
Mark Williams 39038 GM 12 BOLT SHORT PINION.
Brand: Mark Williams Enterprises, Model: 39038