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50-6308 : GM 4wd TH350 to Jeep NP231 23 spline Adapter Kit (#50-6308)

Retail Price: $531.64


Advance Adapter

Our Advance Adapter 50-6308 will allow you to adapt a GM TH350 3 speed automatic transmission to the Jeep NP231 transfer case. The adapter housing is 3.625” in length and is manufactured from 356-T6 heat treated aluminum alloy. We also supply a mounting provision on the bottom of the housing to bolt-on our heavy duty transmission mount (716008). The adapter kit includes an adapter housing, 27 x 23 spline spud shaft, bearing, snap rings, gasket, o-ring, fastening hardware and adapter instructions.

Note: This adapter kit could be used with a long input NP231. This stickout measurement is 2.12” from the face. However, our spud shaft included will need to be shortened.

Transfer Case

The adapter assembly will fit the Jeep NP231 transfer case with a 23 spline input shaft. This input shaft protrudes from the face of the transfer case 1.19”. 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.

The Advance Adapter kit is designed to fit Jeep New Process / NVG models 231, 242, 247, 249 & 2410R transfer cases.


1)1987-06 General Engine Conversion Information

4) New Process 231

1. GM TH350