Jeep Wrangler YJ/TJ/XJ NP231 Short Shaft Kit TeraFlexThe TeraFlex TJ YJ XJ: NP231 Short Shaft Kit increases the rear driveshaft length by 4 Inch eliminating the need for a Transfer Case Lowering Kit in most cases. Also includes a larger output bearing and rear housing. Output housing Transfer case rear output shaft Output Housing Seal (# 231104) Output housing bearing Rear Output Yoke (# 3244404) Output Yoke Flanged Nut (# 231112) All necessary hardware TJ Wrangler (short wheelbase) LJ Wrangler