USA Standard Gear ring and pinion sets are designed to exceed OEM specification. All sets receive rigorous in-house quality evaluation to ensure products pass dimensional, material, and fitment testing.
USA Standard Ring & Pinion Gear Set For GM 12 Bolt Car in a 3.90 Ratio
12P GM 3.91 R&P (fits_3.90_&_DWN_CSE) ** USA STANDARD GEAR **
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Differential Ring and Pinion
Ring & Pinion Set
ZG GM12P-390
