Quote:
Originally Posted by RICKYRJ1
I have WAZOO installed 3.73's. I run both 18" and 19" rears depending on what look I prefer at the time. Where does that put me? We installed the correction gear at the time of install. I have only driven her with the 19's on since the install, car feels good.  |
Where does that put you? Your 3.73 is "still" a 3.73 gear
These are 1:1 4th gear calculations:
Using Phil's 345/30/19 (27.1) and your 3.73 gear 65 MPH: 3006 RPM, 100 MPH: 4625 RPM
Using a 315/35/17 and your 3.73 gear 65 MPH: 3170 RPM, 100 MPH: 4877 RPM
Your speedometer error actual/displayed: 60/56.8 - 100/94.6 - 140/132.4 These are calculated using advertised diameters not "rolling radius" but it's very close to what Phil mentions using the GPS.
To regain the RPM if you're "performance minded" I'd think it would require a 3.92 gear 65 MPH: 3159 RPM, 100 MPH: 4860 RPM
If you wanted to relate what the 345's did to your present 3.73 I'd guess you'd do the 3.73/3.92 = .9515 X 3.73 = 3.55
Seems logical to me but then again..........