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msgross · 03-23-2010, 04:33 PM

pull the back cover off the diff, look for the ratio on the ring gear (i.e. 41:11 = 3.73 etc) doesn't hurt to change gear lube anyway.

If you have anything lower than 4.10 then you might want to swap, if you have 3.08's then your engine will really be bogged down.... Bigger tires need a lower gear (higher number)...

03-23-2010, 04:33 PM	#3
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Matching tire size to gearing/drivetrain? pull the back cover off the diff, look for the ratio on the ring gear (i.e. 41:11 = 3.73 etc) doesn't hurt to change gear lube anyway. If you have anything lower than 4.10 then you might want to swap, if you have 3.08's then your engine will really be bogged down.... Bigger tires need a lower gear (higher number)... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"