This Heavy Duty Slip Yoke eliminator kit fits Jeep NP231 transfer cases. This kit features a new 1 3/8”-32 spline rear output shaft, 356-T6 heat-treated aluminum alloy tail housing, 1310 c.v. yoke (other styles of yokes available), bearings, fastening hardware, and detailed instructions.
Note: We have designed our heavy-duty fixed yoke output shaft with the most current design shaft found in the New Process Gear NP231. This current design shaft was introduced in 1997. Jeep vehicles using the early NP231 can still use our kit, providing that the needle bearings are removed from the stock drive sprockets.
Introduced in 1988, the Jeep NP231 is a part-time transfer case became the standard for XJ and YJ models. It was also used in six-cylinder ZJ models through 1995. Chain driven with a 2.72:1 low range, it’s reliable even with more than stock horsepower applied.
We recommend a slip yoke eliminator kit for XJs & TJs with over 3" of lift. This kit is specifically designed for 231 transfer cases only.
DRIVESHAFT MEASUREMENT GUIDE: