What is wrong with the rear end to say it is shot? If you get the one wheel peel, the t-lock can be rebuilt with new clutch packs. I my opinion if you are going to change out the carrier with eaton, then might as well get 31 spline axles & carrier, good time to upgrade. FRPP has a 31 spline t-lock carriers also. Eaton is a good carrier. A locker on the street can be noisy, not good in the rain.
Also depending on mileage, good time to change the bearings while you are in there.