Hey guys. I was playing with gear ratio calculations on Mfacotry and was wondering if you all think my car has a stock of higher final drive.
I am rolling in 255 40 17 all four corners. At 75mph in 6th gear I am turning 4000rpm.
According to the gear calculator I should be lower. Assuming I read it correctly.
All input appreciated!

 

sounds about right for an AP2

there is a secondary reduction gear that you might be missing in your calculations

 

Ok thanks. If I jumped to a 4.4 FD what RPM do you estimate I'd be at when cruising at 75mph?

 

7% higher than stock 4.1

 

Thank you very much afzan!