Richmond Ring and Pinion - 3.73 Ratio - 30 Spline Pinion - 3 Series - 8.875 in - GM 12-Bolt 49-0039-1 R010003YM All American 400 and any

All American 400 and any late model race requiring on-the-fly pit stops

Kits hold torsion arm and stop in place if pinch bolts loosen or breakage occurs

Steel wire rings for the greatest combustion seal strength

GM A-Body / F-Body / X-Body

individual cylinder control and more click the document icon under the product image

Richmond Ring and Pinion - 3.73 Ratio - 30 Spline Pinion - 3 Series - 8.875 in - GM 12-Bolt 49-0039-1 R010003YM All American 400 and anyRICHMOND 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,