Originally Posted by martin-reyland

yes that would be ok but in an ideal world you would use the rear 3.9cwp in an uprated diff. as far as i can remember when fitting the chain and smaller diameter gears in the transfer box you will have a bit of grinding to do as the chain catches some raised area's of the alloy casing, not a big deal but worth mentioning all the same. you can have your existing chain shortened if it's in good order.