Quote:
Originally Posted by RUQWIKR
Wrong. Your driveshaft speed on a rear drive (trans in front) is your engine speed divided by your trans ratio. So, in first gear, it is spinning significantly less than engine speed, in fourth (ours is 1.00 ratio), it is the same, but in 0.50 ratio 6th, it is spinning twice as fast.
That's why it is called overdrive because the trans output shaft connected to the driveshaft spins faster than the trans input shaft on the engine side.
With no clutch or torque converter slippage: Engine RPM / trans ratio = Driveshaft Speed
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I understand how transmissions work.... and you do too. Discussion was about the critical speed capability (max rpm) of the drive shaft.
....assuming you reached 160mph somehow (your example) the drive shaft is turning at an rpm based on the rear diff ratio... it doesn't matter what gear you used to achieve it. Yes, in 4th gear your engine would be at higher rpm than 5th or 6th gear... but engine rpm is irrelevant here.
not wrong.
