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Toyota Dual Transfer Cases

[date: 2004-01-01]

Toyota Dual Transfer Cases

This is in regards to stuffing dual transfer cases into rock-crawling 1980-ish through 1995 Toyota pickups and 4Runners. It took me a while to learn the basics (everyone seems to assume you just know everything already), so here are some facts:

The transfer cases on V6 trucks use planetary gears, and the front is chain driven. These things make it hard to regear the tcase. If you want to go lower, you have to throw that transfer case out and get 1 or 2 tcases from a 4 cylinder truck.
...but to do that (i.e., to mate a 4-cyl tcase to a 6-cyl transmision), you need an adapter between the transmission and the 4-cyl tcase. Advance Adapters makes them.
For dual tcase setups, you need an adapter between the two tcases. Again, see Advance Adapters.
T-cases from 4 cylinder trucks are gear driven.
85 and older 4-cyl tcases are "21 spline". I've read that these are weak. Avoid. (Perhaps some supercharged models were 23 spline; I'm not sure.)
86 and newer 4-cyl tcases are "23 spline". Stronger.
...well, usually. I just found a 21 spline '86. Hm.

Advance Adapters

I avoided all this, and put a low-geared 4.70 single tcase in my truck, from Marlin Crawler.