-------------------------------------------------------------------------------------------------Just put the 3.64 diff in my 89 750 and it used to be 2000 RPM at 70mph now it is 2500. A little snapier off the line and cruise is actually beter at 70 because the engine is revving higher you don't have to throtle it as much to gain speed above 65.------------------------------------------------------------------------------------------- For those of you with a '91 or later 750iL, I'd like to know for reference what your RPM's are at 70mph/113kph in the highest gear/lockup. The '91 and later models were fitted from the factory with the 3.64 differential. My '90 with the 3.15 sits at about 2000rpm at 70mph/113kph. I'd like to know what the difference is between the two differentials.
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