Quote:
Originally Posted by dkr
Part of the deal was that he had a 1985 differential that was just sitting and I was able to get that put back in my car when he pulled my diff. Right now, it looks like my speedometer is off by a few mph at lower speeds and up to about 10mph at freeway speeds.
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1) Inasmuch as the OP has not stated the ratios involved, all discussion and calculation is speculative and hypothetical.
2)
IF a 3.07 ratio was replaced by a 2.88, the driveline, and hence the speedometer drive, will rotate at .938 of the original. The speedometer will read slower than actual road speed. At 75 MPH road speed the speedometer will indicate 70 MPH. At 150 MPH there will be a 10 MPH error; a remarkable W123 indeed!
3) The installation of larger diameter tires will
increase the amount of error, not offset it. The driveline will rotate even slower for a given road speed.