Help with differential ID

[tme]

I have a 1965 valiant with the original 7 1/4 inch rear end. Looking to upgrade do something a little bigger, also with the larger bolt pattern. I found this one at a local junkyard and wondering if it will do the trick. It is in a 1987 dodge diplomat. It’s 1” longer than mine.

 

[Garrett Ellison]

That is actually a late model 7-1/4, somewhere between a Dana 30 and 35 is about the best comparison I can give for it. The giveaway is the axle tubes that get larger after the exit the housing. Large bolt pattern too. Unless it has a locker and 2.94 or lower gears, I would not use it in a performance build.