Engine RPMs.

[rashwor]

Just wondering what you guys are seeing RPM for the following combinations:



1) Cummins, 3. 73 diff, 6 speed manual in 6th at 70mph = ???? rpm



2) Cummins, 4. 10 diff, 6 speed manual in 6th at 70mph = ???? rpm



3) Cummins, 3. 73 diff, 6 speed manual in 6th at 65mph = ???? rpm



4) Cummins, 4. 10 diff, 6 speed manual in 6th at 65mph = ???? rpm



Also note the tire size you are running on the truck and if other than stock, has the speedo been recalibrated?



For example I run 215/75/16s and at 65mph with 3. 54 diff I am turning 2000rpm.



TIA.

 

[SRadke]

3. 73 ratio's with stock 265/70/17 with my five speed gives me about 2050 at 65. Should be very similar with a six speed. I don't drive faster than that often enough to remember the rpm.



-Scott

 

[klenger]

Figure them out for yourself with the Excel worksheet at http://www.klenger.net/dodge/general-reference/gear-speed-calculator.xls

 

[SRadke]

Excellent spreadsheet, thanks.



-Scott

 

[Dean Upson]

This might help http://www.f-body.org/gears/



Dean