Nice, sounds like the right call. I ended up going the same way with my 745 which does have the 3.91 rear. It did help bring the revs and noise down (although with speedo error of course) at freeway speeds.
How does the car overall look now with the taller suspension and tires?
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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