GM 8.5in. 10 Bolt Rear Axle Shaft Replacement Axle Shaft; GM 8.5in. 10 Bolt; 30 Spline; 6 on 5.5in. Bolt Pattern; 30.625in. Overall Length; Driver Or Passenger Side; Does NOT Include Bearings Seals Or Studs; For Use In 99-01 GM 1500 4X4 CHEVROLET GMC SIERRA 1500 SILVERADO 1500 BASE SL 1999 2000 2001 4.3L L35 (262) Vortec 4.8L GEN III LR4 Vortec (294) 5.3L GEN III LM7 Vortec (325) GAS Alloy USA Alloy USA GM 8.5 Inch 10 Bolt Rear Axle Shaft - 17129 17129 Replacement Axle Shafts