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GM TH400 Automatic Transmission to the Jeep Dana 18/20 Transfer Case (with 6 spline drive gear) Adapter Kit

Your Price: $529.08
Retail Price:$555.53
Your Savings:$26.45(5%)
Part Number:AA-50-1300

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Advance Adapters

The TH400 adapter to the Dana 18 / 20 is 2.875” in length. And the overall length of the transmission and adapter is 27.125”. Adapter material is 356 T-6 heat treated aluminum alloy and the adapter has a provision for a transmission mount. The adapter kit includes an adapter housing, new TH400 out put shaft, 6 spline spud shaft, bearing, snap ring, gaskets, seal, fastening hardware, and adapter instructions.

Transfer Case

This adapter assembly will fit any Dana Spicer 18 / 20, Scout version with a 6 tooth female drive gear. The transfer case index to the new adapter will require an index retainer & sealed bearing. Please I.D. the transfer case bore size (3-1/8”) small hole or (4”) large hole for proper retainer. Additional information can be obtained in our on-line catalog, Jeep & Scout Vehicle Section: Transfer Case Information, Jeeps 1941-79.


This adapter assembly is designed for exclusive use with the GM TH400 transmission, 2wd or 4wd version. The adapter housing has been drilled to accept the AMC TH400 rotation.