HIGH PERFORMANCE 1350 SERIES PINION YOKE WITH NUT, WASHER, STRAPS AND BOLTS FOR THE GENERAL MOTORS 10 BOLT 8.6 INCH DIFFERENTIALS USED 1/2 TON TRUCKS FROM 1999 THROUGH PRESENT. STOCK REPLACEMENT FOR 2008 AND NEWER, PERFORMANCE UPGRADE FOR 1999 THRU 2007 PLEASE CALL CONCERNING THIS CHANGE. 1.188" CAP DIAMETER BY 3.625" LOCK UP REFERENCE ACROSS THE CAPS IS THE DIMENSIONS OF 1350 SERIES U-JOINT. NOT SURE IF THIS WILL WORK FOR YOU? FOLLOW THE INSTRUCTIONS BELOW AND WE WILL CHEERFULLY ASSIST YOU IN DETERMINING WHAT WORKS AND WHAT WON'T.