RICHMOND 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 10 Bolt "New Style"Installation Notes: When replacing a stock 2. 56 and numerically lower, the carrier must be replaced with a carrier of 2. 73 or higher.Pit Stop USA offers Richmond Ring & Pinion Set - 5.13 Ratio, 41-8 Teeth, GM 10 Bolt "New Style" (70-94) 69-0171-1 at low everyday prices. Be sure to check out all of our products from Richmond Gear including Richmond Gear GM 8.5" 10 Bolt Ring and Pinion.