TH350 X JEEP DANA 18/20(-1312)

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 4×4 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

• SNAP RING (T350 / T400) / 716450
• TRUE ARC SNAP RING HO-315STPA / 716456
• GM AUTO TRANSMISSION O RING / 716511
• ADAPTER- TH350 TO JP D18/20 / 51-1700
• SHAFT- SPUD GM 27TF X JP 6TM / 52-1300
• SEALED BEARING 209RS / 716308
• S.H.S.S. 7/16 -20 X 3/8 CUPPT / 724319
• NUT-NYLON LOCK 7/8 -16 / 728701
• T.C. GASKET/JEEP or TOY L/C / 716568
• SEAL- JEEP TO TH350/400 KITS / 716711
• S.H.C.S. 3/8 -16 X 2-1/4 / 723728