MW 12" Pro Gears

Ford 10" Gears

MW 12" modular ring and pinions are made of 9310 pro gear material, fits MW modular differentials, uses 14 ring gear bolts, has a 9/16"-18 thread, 2.167" rear bearing diameter, and 40-spline input. Pinion shafts have a 3/8" hex for oil pump drive. 

Manufactured from ultra-tough 9310 steel, these gears are specifically engineered for drag racing and competition use where extreme torque loads and high horsepower are the demanded. Unlike street gears, Pro Gears are designed for the strip, trading longevity for the ability to withstand repeated hard launches and shock loading without failure.

Gleason Gears: M/W-Gleason 12” Gears are produced from 9310 alloy. These Ring and Pinions are the next step in durable gearing. The M/W Gleason series gears have a ground tooth form and are Cold Stabilized, Shot Peened and REM isotropic surface finished. These gears fit MW modulars with series 2 spool (P/N  53104) .  Pinion shaft has a 3/8" hex for oil pump drive. These Gears are the latest improvement for the 12” Modular Rears.

Regal-Beloit Gears: Precision-engineered solutions for industrial and heavy-duty applications. Built to handle demanding environments, these gears are designed for efficiency, reliability, and long service life across multiple industries.

Specifications:

• 12" ring gear diameter
• 40 spline pinion
• 2.167 Pinion Stem
• 9310 material
• 3/8 Hex Oil Pump Drive
• 14 Ring Gear Bolts

Available in the following gear ratios:

• 2.91 - Series 1 (Regal-Beloit)
  
• 3.20 - Series 2 (Regal-Beloit)
• 3.89 - Series 2 (Regal-Beloit)
  
• 4.11 - Series 2 (Regal-Beloit)
• 4.29 - Series 2 (Regal-Beloit)
• 4.44 - Series 2 (Gleason Gear)
• 4.57 - Series 2 (Gleason Gear)
• 4.71 - Series 2 (Gleason Gear)
• 5.00 - Series 2 (Gleason Gear)
  
• 5.14 - Series 2 (Gleason Gear)
• 5.43 - Series 2 (Gleason Gear)
• 5.83 - Series 2 (Regal-Beloit)

Add On Gear Treatments:

• Supra-Fin Polish Ring Gear
• SUBZ - Subzero Treatment for Ring Gear
• PEEN-02 - Shot Peen Ring Gear
• LRG - Lighten Ring Gear

NOTE: 9310 Pro Gears are not intended for street use, their softer composition maximizes shock absorption but results in shorter wear life under constant driving.