TH350 4WD-NP231 27T 95 and NEWER

Advance Adapter

Our Advance Adapter 50-6805 will allow you to adapt a GM TH350 3 speed automatic transmission to the Jeep NP231 transfer case. The adapter housing is 1.50” 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, new 27 spline NP231 input shaft, bearing, gasket, seal, o-ring, fastening hardware and adapter instructions.

Note: the new NP231 input supplied in this kit cannot be used with a Tera 4:1 kit

Transfer Case

The adapter assembly will fit either the Jeep NP231 transfer case with a 21 or 23 spline input shaft. This input shaft protrudes from the face of the transfer case 1.19” or 2.12”.

Note: the new NP231 input supplied in this kit only fits NP231 model years 1995 & up.

Transmission

This adapter kit is designed for exclusive use with the 4wd GM TH350 automatic transmission. This GM automatic was commonly found stock in vehicles from 1969-81. It was used in both pickups and car applications. The TH350 has an aluminum, 1 piece case and is 21.5” in length.

Note: The 1980’s version on the TH350 cannot be used with this adapter

Bill Of Materials

• ADAPTER- TH350 TO JEEP NEW PROCESS / 51-6800
• INPUT GEAR- NP231 27 SPLINE 95 and NEWER (narrow brng.) / 716203
• GM AUTO TRANSMISSION O RING / 716511
• GASKET-N.P.208 TRANSFER CASE / 716517
• SEAL CR#19466 / 716729
• SEAL-NP231 STOCK REPLACEMENT / 716760
• LOCK WASHER 3/8 ZINC / 723704
• H.H.C.S. 3/8 -16 X 1 PLATE GR5 / 723721
• S.H.C.S. 3/8 -16 X 1-3/4 / 723729
• BOLT 3/8 -16 X 1.25″ SHCS ZNC / 723730