Description 8.5" Oldsmobile 31spline 12 bolt (factory 3.08 or 3.23, or Richmond gear ring & pinions). Let us install it!Call Overly's Offroad at 865-995-9800 for installation or help.
Quick view High performance Yukon Ring & Pinion gear set for GM 8.5" & 8.6" in a 3.23 ratio (YG GM8.5-323) $359.89
Quick view High performance Yukon Ring & Pinion gear set for GM 8.5" & 8.6" in a 3.08 ratio (YG GM8.5-308) $587.89
