'75 450SL.

Drives & handles fine except btw (an indicated) 62-65mph she has a pronounced shake in the rear end, then it goes away. It is definitely not in the front suspension. I just had all four tires spin balanced & a new front flex disc.

The differential mount looks good (& there's no clunk anywhere).

Bad rear flex?
Bad carrier?
The new front flex had longer bolts than the ones I took out, but that wouldn't cause such a speed specific shudder...

I should mention that the car has 15" MB rims (from a later 560SL) & the tires are wicked wide (225's), but they're fairly new & were just balanced...

Am I missing something?

Thanks!

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress

The speed range you're talking about ususally indicates unbalanced tires.
Move the tires front /back ( one side at a time ), and see if the vibration moves with the tire ( s ).
The Tire Rack has a pretty good " Vibration Diagnosis Chart " on their website.
You may want to have a look at it, and print a copy of it for future references.

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2007 C 230 Sport.