Nitro Ring & Pinion Ford 9" 4.29 9310 Pro

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Ford 9" High Performance 4.29 Nitro 9310 PRO Ring & Pinion

Great gears deserve a great 3rd member housing, look no further:

Nitro Solid Billet Aluminum Housing

These 9" Nitro Pro Gears are manufactured from 9310 forgings for maximum strength in competition/race vehicles. These gears are not intended for daily driven vehicles as they have a shorter life span relating to their wear characteristics. Please read the tech notes below and if you are unsure of what components you require or have question please call for clarification.

Tech notes:

A different pinion support and bearings are needed to work with the larger diameter pinion shaft.

The cut on these gears is engineered for maximum strength and often these gears will run with significant noise compared with a traditional 9" gearset. This is normal for these gears as they are intended for competition use.

Warranty: Pro Gears are intended for Racing Fits and do not have a warranty as a result.

Gear & Axle strives to provide the highest quality differential components available. We take the steps necessary to ensure our parts are dependable. Our product range is continually growing to meet the needs of consumers for new ratios and Fits. At Nitro, we know differentials and know what it takes to provide you with high-quality components.


Differential: Ford 9"

Gear Ratio: 4.29

Tooth Count: 30/7

Pinion Splines: 35 (Big Pinion)

Ring Gear Bolts: 10, 7/16"-20 (not included)

Manufacturer: Nitro Gear & Axle


1967-1973 Ford Mustang

1967-1973 Boss Mustang

1967-1973 GT Mustang

1967-1973 Cobra

1967-1979 Mercury Cougar

1966-1969 Mercury Comet

1964-1972 Mercury Cyclone

1966-1971 Ford Fairlane

1965-1978 Ford LTD

1968-1976 Ford Torino

1957-1959 Ford Ranchero

1967-1979 Ford Ranchero

1975-1980 Ford Granada

1977-1980 Lincoln Versailles

1957-1980 Ford Thunderbird

1959-1974 Ford Galaxie

1957-1986 Ford F100 & F150 Pickup

1966-1986 Ford Bronco

1968-1986 Ford E150 Van

Circle Track Racing

Dirt Track Racing



Pro Gears are intended for Racing Applications and do not have a warranty as a result.


This product can expose you to chemicals including toluene and benzene, which are known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information go to:


Box Weight: 24 lb

Box Dimensions: 1 x 1 x 1 in

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