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**dmarty** · 10-23-2011, 09:09 PM

Thanks for the info. The 265/65 R18's on the 2012 and the 265/75 R16's on the '99 both have a dia of 31.6". With your smaller tire dia, your overall ratio will be a little lower. I'm curious, do you use the manual button much? If I get the 3.08, and it turns out to be a little too low, I may use the manual +/_ button to drop down a gear on hills. Have you tried that?

10-23-2011, 09:09 PM	#6
dmarty Junior Member Join Date: Dec 2008 Location: Verona, WI Posts: 97	Re: Which axle 3.08 or 3.42? Thanks for the info. The 265/65 R18's on the 2012 and the 265/75 R16's on the '99 both have a dia of 31.6". With your smaller tire dia, your overall ratio will be a little lower. I'm curious, do you use the manual button much? If I get the 3.08, and it turns out to be a little too low, I may use the manual +/_ button to drop down a gear on hills. Have you tried that? __________________ 72 GMC Sierra Grande SWB 402 BB A/C (Owned it since 1973) 99 Silverado 1500 LT with 315K miles (RIP) 2012 GMC Sierra SLT