Speedo picks up from a wheel sensor, not the transmission. No adjustments are necessary after swapping differential gear ratios.
The ncsexpert adjustment is there if you want to code out the 3mph optimistic speed that comes programmed into NA market bmws.
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2012 xDrive35d
2001 BMW X5 3.0i 5MT
and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80
Block Tester
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