CSP got that mostly right, BUT YJ Wranglers most certainly DID come with optional DANA 44 (but not high pinion of course!) I forgot to mention about the rear axle being a Model 20 (same as the Dana 35 is also known as a Model 15 in AMC cars) and that a Dana/Spicer 20 is an early transfercase.
When the axle is in the front, it is a reverse turning diff, which is why a high pinion is better for that application.


Build your truck the head men say, but it must be built in such a way...