Subject: RE: Randys ring and pinion 4.10 ,4x4 IP: Logged
Message: Yeah. That was for MY tires 255 65 16's, and my 5 speed auto :)
Using the online calculator you can plug in your tire size and ratio's to calculate RPM's in 4th gear (1 : 1 ratio) on your manual to get what you would be at and then multiply by what your OD gear is to see what RPM's are then in 5th. Probably .67 or .69 to calculate RPM in OD.