Just saw this on the AA website. Looks like a nice way to keep a toyota tranny with a doubler and get bullet proof transfer case. You could use a 4.7 toybox with a standard gear set 300 and upgrade the outputs. This would give you a stout box with lots of gears. The only problem is, if you have a cruiser you will need a centered rear axle. Just thought I would throw this out to anyone as I am looking for doubler options, and I like my Toyota tranny.
https://eshop.advanceadapters.com/commerce/ccp1157-dana-300-crawler-kit-50-5915-50-5915.htm
Jeremy
https://eshop.advanceadapters.com/commerce/ccp1157-dana-300-crawler-kit-50-5915-50-5915.htm
Jeremy