Specifically the trackfab unlimited. its an excellent mod, but needs 4x4. So far I have tried duplicating the rear diff and changing the R to F. Dumb I know. Then I added the new front diff to the transaxle. Out of some combination of stuff, I managed to get all 4 wheels to spin, but they were self-powered blew up the engine and just kept going faster and faster. However, I forgot the combination that caused that. So ill just consider it proof of concept. Ideas anyone?