how is your rear camber and ride height?

if its low, the inside of the tires will wear out. the diff mount usually wears out and can cause the saggy rear end condition. of course there are many factors that contribute like shocks, springs, trailing arm bushing, subframe bushings, but the diff mount is definitely one of them, and is very easy to R and R.

ddd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car