I've had 2 experiences of a rear D60 in RC's. Both were 75 and 440's.
2 different people but never did receive any proof ie: pics or equipment label.

Intetnational 1110 caryalls and trucks1110 have the perfect width dana60 axle 5 on 5.5 lug for 72 up trucks and ramchargers . My brother has one under his R/C just need to move spring peerches and they fit like factory. Had one under my w150 years ago when i bent the housing I gave him the 35 spline dutchman axles and Detroit locker for 400 bucks. Still going strong behind his 520 ci big block. He is in the process of making a chevy dana 60 front axle 5 on 5.5 with a detroit for the front.

picture of car---no picture of both feet in mouth---the diff is a dana 44 HD--the case casting is about as large as a dana 60----the 44 is cast on an upper web on the front---i have never seen one of these....bob

Yeah, they are a little funky. But the cover is still D44 size.