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Discussion in 'Transmission & Driveline Topics' started by john Gialanella, Nov 5, 2020.
Jodi on post 3 was darn near correct with the math and an automatic without a lock up converter.
336 which is a given to make things work.
The math for a standard transmission with ZERO clutch slippage is.
336 X gear ratio X MPH, divided by Tire diameter = RPM
So you have .
336 x 3.31 x 80 divided by 26.3 = 3382 RPM
Now add 10% for converter slippage you get 3720 RPM and you stated you see 3750 at 80 MPH.
I say about right.
You could have more or less slippage depending on Drag Coefficient weight and how tight or loose the converter is.
I have one low stall 12" converter that has 2400 rpm stall but slips over 15% and another converter I have that is 9" and 4500 stall that has about 1% at 7000 rpm.
The difference is crazy.