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Richmond Gears

Mark Williams Enterprises is one of the nation's largest factory warehouse distributors for Richmond Gear.  At any given time, you'll find over 1,300 ring & pinion gear sets in stock at MW!  This includes standard gears for oval track and street use as well as 9310 alloy "Pro" gears for drag race only applications.  Additionally, Mark Williams Enterprises Inc. has everything necessary to properly install and set up a rear end gear set.  This includes installation kits, tools, measuring devices, gear marking compound, special ring gear bolts, safety wire and gear lube.  Our site offers a broad variety of popular application gear sets.  Competitors and chassis shops alike have come to rely on MW for gears because we offer same-day shipping of stock gears, and competitive prices.
8620 Standard Gears 9310 "Pro" Gears Large Pinion "Pro" Gears
Standard Gears are primarily used in oval track and street applications.  The material and heat treating provide excellent wear service life, but doesn't handle shock loads as well as Pro Gears.  9" Ford Standard Gears have a 28 spline pinion. "Pro" gears are designed specifically for drag racing.  The 9310 alloy and heat treat are ideally suited to absorb high impact shock loads.  9" Ford ratios from 4:86 to 6:50 have 28 spline pinions.  Select ratios available for 12-Bolt & Dana 60. These 9" & 9-1/2" Ford gears are built specifically for ultra high horsepower drag racing applications from 90210 material.  All avaible ratios (3.40 to 4.86) have a large 35 spline shaft.
9" Ford Gear Notes

While many new 9" gears are now manufactured for clearance, many 9" Ford ring gears require modification to clear the pinion pilot bearing area.  Do not grind on the case.  Instead, chamfer the ring gear for clearance. 

Oval Track applications require a baffle to prevent all the lube from becoming built up in the right axle housing tube.  We recommend using one gallon of Torco GL-6 racing gear oil, SAE 85 w140  (part number 55-0030, 1qt.). 

If using a stock Ford front pinion bearing support, it must be the unit that has the HM89443 rear cone.  Richmond Standard Pinion Pro gears must use a HM89444 rear cone.  This bearing has a larger radius that matches the increased radius in the pinion.  The recommended pinion support is our Heavy Duty Support, part number 57620 or 57670, which uses even larger bearings.  All 35 spline pro gears must use the pinion support, part number 57630 or 57680, with matching coupler or yoke. 

Some gears do not have the engraved pinion setting depth (OEM gears); however, the setting depth can be calculated.  The master housing dimension for 9" Ford is 4.375".  This is the distance from the centerline of the thirdmember case main bearing bores, to the shoulder that the stock rear pinion bearing would stop against.  By measuring the pinion head thickness, then substracting this measurement from 4.375" (master housing dimension), the setting depth is obtained.  Some of these pinions are marked with a + or - and a number.  This is the variance from the master housing dimension that the pinion needs to be set.  Example: If the pinion is marked +2, the master housing dimension would be 4.375" plus .002 or 4.377".

GM 12 Bolt Carrier Notes

Which Series Carrier?
2 Series
3 Series
4 Series

Check the distance from the bearing shoulder to ring gear flange ("A") to determine the carrier series for proper ring & pinion selection.

Dana 60 Gears Ford 7.5-8.8 Gears Ford 9" Street Gears
Ford 9" Pro Gears Ford 9-1/2" Gears '55-'64 Chevy Gears
Corvette Gears GM 10 Bolt Gears GM 12 Bolt Gears
GM Truck Gears Mopar 8-1/4"-8-3/8" Mopar 8-3/4" Gears
Mopar 9-1/4" Gears Olds Pontiac Gears MasterLine Gears