Quote:
Originally Posted by WVZR-1
Bob,
That works well if the tach is "correct"! It didn't seem to me that the OP's tach was correct and I mentoned confirming the speed which is quite simple with GPS and using a little "a$$ - backwards" logic to confirm the tach error! I assumed that the OP has a 4.10 and that it's got some sort of modification for the speedometer correction. Does he? Don't know!
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Sure, but he just asked what the expected rpm was at 80mph with 4.10's. That's what it is. If his isn't that, sure it could be plenty of problems causing it.
