Richmond Ring & Pinion Set - 4.88 Ratio, 39-8 Teeth, GM 12 Bolt Jones Racing Products This porting mandrel is 6"

This porting mandrel is 6" long with a 1" x 18" wide tip

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Richmond Ring & Pinion Set - 4.88 Ratio, 39-8 Teeth, GM 12 Bolt Jones Racing Products This porting mandrel is 6"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 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,