Please read my post again - “at a given vehicle speed”.
No arguement that going faster makes the prop turn faster.
Agreed, I was making a case for the possible need to look at the driveshaft balance, to rule out possible harmonics
Mike
agreed, no matter what speed, the tire/rear gear combo will be turning xxxxrpm.
however, more than once, i have found deep gears and a short tire has caused driveshaft vibrations because the shaft was only balanced at a somewhat low speed.
balancing the shaft at a high speed cured the vibration issue.
just putting this out there as something else to look at if the vibration continues after fixing the driveline angle[s].
