i have run across a set of dana 70 4;56 ring and pinion. the pinion is a 29 spline, guy says it fits a dana 70b,70u,or a 7070hd with a 5/8 pinion offset. my big question is will it work in a stock m715 rear differential? i have the 4;56's for the dana 60 front and have looked everywhere with no luck for the rears. any help would be appreciated . i am kind of lacking when it comes to knowledge on the differentials. thanks ,larry