lucky7 already has a T100 auto trans in his 4Runner with a 30-4GT adapter plate to a single gear drive t/case with 4.70:1 gears.

lucky7: You need to check if your new auto & t/case has a 9-bolt divorceable t/case.

In such case, all you need is another donor gear drive t/case for use to assemble a MC07-generation Crawl Box (or a billet MC08-generation).

The MC10 would not be good for you since you already have a 4.70:1 gear drive t/case. The MC10 allows a right-hand chain drive t/case to be mounted behind a gear drive reduction housing. Therefore, only use the MC10 if you plan on also using a stock chain drive t/case.

If you want to go duals with a gear drive 2.28:1 Crawl Box in front of your 4.70:1 gear drive T/case, then you need the MC07- or MC08-type adapter.

BigMike