Nitro Billet Ford 9" Custom 3rd member, with Nitro Helix Limited Slip

Price $3,458.59
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Ford 9" Nitro Billet Aluminum 3rd Member with Nitro Helix Limited Slip Choose Ratio & Spline Count

Recommended: 3 quarts of Nitro Synthetic Plus Gear Lube

Now you can run the Nitro Billet 9" in your Daily Driver, Street Rod, 4x4, Trail Vehicle, Weekend Warrior, Grocery Getter, etc!

Why run a refurbished cast unit in your special project, when you can run this USA Made, Billet CNC Machined work of art?

100% Made in the USA!


  • Use with any Ford 9" Axle housing and 31 spline axles.
  • Same USA Made Billet 3rd Member case as our full competition Pro 40 Series, but this ones is assembled with a street-able gearset, and can be used with the standard 31 or 35 spline air locker. This combination makes them more affordable and long lasting for vehicles driven on and off the road! Great for popular aftermarket upgrades on Jeep TJ, JK, Toyota Tacoma, etc. Designed to hold up where the factory rear application may not, Heavy Overland equipment vehicles, over-sized tires, etc.

Tech Note:

  • 21 spline pinion
  • Choice of gear ratio & axle spline count.
  • Use with any Ford 9"


  • Nitro 9" Billet Housing
  • Nitro 9" Ring & Pinion Gears
  • Nitro Master Install Kit
  • Nitro Solid Pinion Spacer
  • Nitro 1350 28 Spline Yoke
  • Nitro Helix Limited Slip 31 spline
  • Professionally assembled and ready to install in your 9" axle housing.

Professionally assembled and ready to install in your 9" axle housing.

Manufactured right here in the U.S. of A., these Nitro 3rd Members are CNC machined from aircraft grade 6061-T6 solid billet aluminum. High strength studs support the billet caps and adjuster nuts. These units feature a load bolt and use a billet 10 bolt Daytona style pinion support retained with high strength studs and hardware. Engineered for maximum stiffness and minimum defection these 3rd members are built in house to exacting specifications for extreme reliability, optimum street performance and stunning good looks. This Nitro Aluminum Billet combination is ideally suited to street/strip use and does not require additives or additional maintenance after installation. More aggressive differential options are available (lockers, spool, clutch type LSD units) " call 1-866-349-6801 for a quote.

Nitro Gear & Axle strives to provide the highest quality differential & axle 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.


  • State of the art CNC machined parts
  • Housing body cut from solid 6061 T6 billet aluminum
  • Main Caps cut from solid 7075 T6 billet aluminum.
  • High-strength load bolt to prevent deflection
  • Pre-drilled and tapped for a Nitro Helix Limited Slip Ford 9” or 10" Ring & Pinion sets, 28-35 spline pinion
  • Far stronger than other OE, Aftermarket Aluminum or Iron Dropout housings
  • 20-30% lighter than nodular iron drop-outs
  • Greater heat dissipation from aluminum vs. iron keeps your oil and gears cooler and lasting longer
  • Compact bearing main cap design allows fitment in any stock or aftermarket Ford 9" housing
  • Precision machined parts improve gear set-up pattern consistency
  • Made in the USA!



Differential: Ford 9"

Gear Ratio: All 9"

Carriers: Nitro Helix 31 Spline

Manufacturer: Nitro Gear & Axle

Warranty: Nitro


*All Nitro Gear & Axle brand products are warrantied to be free of manufacturer defects for the specified period. Warranty requests must be made by the original purchaser and submitted by the dealer purchased from. Any parts sent for warranty consideration must be pre-approved and shipped prepaid freight to our facility with copy of RGA for our inspection & determination. We will not pay for labor, shipping cost, loss of revenue or perishable goods, commercial losses, costs of telephone calls, shipping or general inconvenience. This is our only warranty expressed or implied. Unauthorized warranty returns may be refused. Warranty generally covers MFG defects in material or workmanship. Abuse, overloading, improper lubrication, misuse, commercial or competition use voids warranty. Normal characteristics are not warrantable, such as Gear whine. Minor cosmetic flaws, dings, burrs from shipping or manufacturing, are not considered defect, it is installer responsibility to address these at time of install. Customer is responsible for shipping charges if warranty is granted. Warranty is for the original purchaser/user, is not transferable. Warranty covers one replacement or credit solely at our discretion. Warranty determinations are at our sole discretion.

In addition to the above conditions, see special notes for these products:

Ring & Pinion - Warrantied against manufacturing defects. 2 years from date of purchase. Must provide set-up specs.

Chromoly front Axles, Excalibur Joints, 30/30 Birfield kits - Warrantied against manufacturing defects for the life of the vehicle. These products are also covered for Breakage. The Shaft / joint must be BROKEN. Wear, twisting, bending are not warrantable. Damages caused by failure of other parts are not warrantable, for example broken U-joint (other than Nitro Excalibur) causing damage to Axle ears.

Rear Chromoly Axles - Warrantied against manufacturing defects for 5 years. These products are also covered for Breakage. The Shaft must be BROKEN. Worn, twisted, or bent axles are not warrantable.


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: 85 lb

Box Dimensions: 1 x 1 x 1 in

Shopper Approved Review

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