OEM Ring & Pinion set for GM 8.5" & 8.6" in a 4.11 ratio.
Original Factory gear for GM 8.5" (no ABS) in a 4.10 ratio. Two-step - face to flank set-up only. OEM gears are recommended for quiet applications where noise may be an issue. Factory gears are the quietest application available on the market and often co
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