50-5702 : GM 4wd Th350 to Toyota truck 21 spline Adapter Kit (#50-5702)

Retail Price: $533.91

Advance Adapter

The GM TH350 3 speed automatic transmission adapter to the Toyota Truck gear driven transfer case is 3.50”. The adapter material is 356 T-6 heat treated aluminum alloy. Our adapter kit will include the Adapter Housing, a 27x21 coupler, nylon bushing, cover plate, gaskets o-ring, seal, fastening hardware and adapter instructions.

Transfer Case

The adapter assembly fits the Toyota Truck 21 spline gear driven transfer cases. This transfer case has a male 21 spline input shaft and can also be identified by 7 bolts attaching the tailhousing to the transfer case.


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 2.750”. And this TH350 also uses a lock-up torque convert, and was always used with an aluminum transfer case. We recommend the 1980-81 model not be used.

1. Toyota Truck General Info

1. Engine Swap Info Toyota Trucks

3. Transfer Cases & Adapters Toyota Trucks

1. GM TH350

Top Reviews


by Taryn Leys , from Fort worth TX

Toyota adapter

The product we ordered was great, there was a great sale on the part which makes it even better. My only complaint is that it was ordered during the holidays and took around 10 days to ship. This was not noted anywhere during the order process and this was very frustrating. After it had not shipped in a few days I emailed the order support and found out it would not ship until sometime during the next week. Even when I was told it would ship within 24 - 48 hours after they reopened it still took longer.

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