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1978-1981 Pontiac Catalina
6 AN Male to 1/4 NPSM Male
Investment in people and dedicated in-house design and development facilities ensures that our customers have access to the most effective
1975-1977 Oldsmobile Starfire
Two 12 AN Female Forward Pickups
Richmond Ring & Pinion Set - 3.90 Ratio, 39-10 Teeth, GM 12 Bolt R07C09YS 1978-1981 Pontiac CatalinaRICHMOND is the leading manufacturer of professional quality, hi performance ring and pinion sets. For over 80 years, the Double Diamond has signified the highest quality gears in the racing industry! GM 12 Bolt Installation Notes: When replacing a 2. 73 3. 90 ratio with a Richmond Hi Performance Ring & Pinion, the carrier must be replaced with a carrier from a stock 4. 10, 4. 56 or 4. 88 ratio. When installing 5. 14 to 6. 14 ring & pinion sets,
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