Richmond Ring & Pinion Set - 3.89 Ratio, 35-9 Teeth, Ford 9" Centerforce Regulator is not required for

Regulator is not required for most applications

GM A-Body 1965-75

Will fit 1965-1967 289 engines originally equipped with a cast iron water pump

For EFI applications use regulator P/N 13113

Richmond Ring & Pinion Set - 3.89 Ratio, 35-9 Teeth, Ford 9" Centerforce Regulator is not required forRICHMOND 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! Richmond Gear is famed for their tough and reliable ring and pinion sets. That same level of reliability and precision is available in their other driveline products, including differentials, racing Transmissions, driveshaft components, and more.