Reduce drive line vibration on lifted vehicles with this Slip-Yoke Eliminator Kit for Jeep's with the NP231J transfer case. Transfer case tail shaft length is reduced by nearly 7" on '97-'01 Wranglers and over 4" on '88-'95 models resulting in improved drive line angles. Kit includes a redesigned transfer case main shaft which is not only shorter but has a larger spline diameter with more splines.