Advance Adapter
The GM TH350 adapter to the Dana 18 / 20 is a short 1.850". And the overall length of transmission and adapter is 23.35". The adapter material is 356 T-6 heat treated aluminum alloy and the adapter has a provision for a transmission. The adapter kit includes a adapter housing, 6 spline spud shaft, bearing, snap ring, o-ring, seal, gasket, fastening hardware and adapter instruction.
Transfer Case
Stock 6 spline 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.
Stock 10 spline transfer case: This adapter assembly will also fit any Dana Spicer 18 / 20 version with a 10 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.
You will need to purchase a new 6 spline drive gear, J0809297. This *20 Degree pressure angle gear fits model 18 transfer cases with 2.46:1, w/ T14 transmission, 1 ¼” intermediate shaft CJ with Buck V6 (68-71).
If you have a Jeepster, you will need J5354506. This is a 17 Degree pressure angle gear: Model 18 transfer cases with 2.03:1, w/ T14 transmission, 1 ¼” intermediate shaft Jeepster/CJ (67-74).
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. The Turbo Hydramatic 350 three speeds automatic is one of the most transmissions available in GM 4x4 trucks. The stock 4wd output shaft protrudes from the back of the case approx 1". 1980-81 model TH350 4wd output protrudes out 5.00". And this TH350 also uses a lock-up torque convert, and was always used with an aluminum transfer case.
Bill Of Materials
