Advance Adapters NP231 Transfercase SYE Kit - Fixed Yoke Non CV 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 tailhousing, your choice of yoke*, bearings, fastening hardware, and detailed... MSRP: Was: Now: $250.74 Add to Cart