Richmond Ring & Pinion Set - 4.88 Ratio, 39-8 Teeth, GM 12 Bolt 93112 The top of the button

The top of the button is a mushroom style

noise-canceling microphone is adjustable to allow for optimum spacing from the mouth to reduce external noise

A precision reluctor is mounted to a QPQ-coated steel shaft which is guided by a sealed ball bearing for accurate timing signals throughout the entire rpm range

NO INSERT - one piece CNC machined billet for light weight and heat dissipation

E-200 Econoline

Richmond Ring & Pinion Set - 4.88 Ratio, 39-8 Teeth, GM 12 Bolt 93112 The top of the buttonRICHMOND 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,