Part # 9100225
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Rear Position, Semi-Floating Axle Type, 31 Axle Splines
Comes as a Kit
Need To Know
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Rear Housing and Axles
These bolt-in rear axle packages are designed to replace the original '64-'66 Mustang rearend housing and are compatible with the stock rear suspension found in your Mustang. The major advantages gained by upgrading to a Ford 9" axle include greatly increased strength (reliability) and tremendous aftermarket support (parts availability). Here are the features you'll find in our fabricated Ford 9 Inch axle kits:
Housing studs and ring gear bolts complete the package for your racing or street use 9" Ford axle.
Side bell thru bolts torque to 40-45 lbs.
Knurl diameter .398-.403 "
As featured on Classic Truck’s Week to Wicked. Watch the transformation here!
Assembled by Professionals
Hand-assembled by trained experts in-house, our Ford 9-inch third members are built from quality components with an exact step-by-step process. We bring this combination of precision assembly and quality components to you at a price that can’t be beat. We trust these third members so much, they’re the go-to choice for our own rides, from the street to the track.
Tough, Nodular Iron Center Section
Our Ford 9 Inch Nodular Iron Third Member Center Section Carrier starts with a NEW casting with over 4 lbs. of additional material in critical areas. Nodular (ductile) iron is much more resistant to fracturing than OEM “gray” iron. Extra ribbing reinforces the case and rearmost pinion support (pilot bearing).
Thick, forged steel bearing caps surround the carrier bearings, all securely held in place with precision Grade 8 cap screws. The improvements continue with rugged billet steel adjuster nuts and heavy-duty keepers to ensure your ring gear settings are maintained. All mounting surfaces are precision machined to ensure a consistent, flat surface for a positive gasket seal (no more leaks on your shop floor). An oil fill plug is included.
Precision Assembled for Proper Ring Gear Teeth Pattern
Getting a proper pattern on the ring gear teeth is crucial. Our time-proven, step-by-step process ensures the correct backlash, preload, and proper amount of pinion shims to ensure the correct pattern on the ring gear teeth. Our gears use use cold-rolled 8620 steel, known for its long-wear and durability.
To ensure a proper gear pattern, we use a stronger “Daytona” style pinion bearing support to maintain that critical pinion depth setting. Stronger due to its larger bearings, our Daytona pinion support also uses the spacer-and-shim setup to maintain critical pinion depth settings under high load, unlike traditional crush sleeves which often compress further, take out your preload and lead to failure. With solid bearing spacers and the proper shims, we eliminate this problem and make setting preload easy and repeatable during installation, service and gear changes. Since preload is already set, simply torque the pinion nut to 160 ft./lbs. and you’re good to go. The pinion gear is connected to our new, forged steel “Ford short”, 1310-type pinion yoke.
Clutch-Style Posi Differential with Proven Performance
Our clutch-style posi differential gives you maximum traction. Based on the original limited-slip designs of the OEMs, these differential units provide the added benefits of experience over millions of miles and decades of proven reliability. A clutch-style operation means no clicking around corners and our posis feature heat-treated spider gears in a forged steel case. We’ve taken this posi to the next step in performance with increased clutch pressure and holding power, suiting it well for heavy-duty street car applications.
This differential has performed well in our Week to Wicked 1952 Chevy Truck, handling the job of transferring a 430 HP GM Performance LS3 to the ground.
We run what we sell. Our third member units are the go-to choice for our own rides and we have built these units to last with high quality hardware and components. Tapered steel roller bearings minimize friction, better handle thrust loads and increase load carrying capacity. The ring gears are assembled with Grade 9 bolts with a tensile strength of 180,000 psi, a 15% increase over Grade 8 hardware. Heavy duty Grade 8 carrier cap bolts, a lock-style pinion nut with pre-applied Loctite and high-quality grade 5 pinion support bolts make our third member near-bulletproof.
Units include a Viton® pinion seal providing long lasting oil and chemical resistance. This seal retains elasticity up to 399°F (204°C) and intermittently up to 600°F (316°C) This high temp seal helps eliminate pinion leaks, reduces maintenance and keeps the third member properly lubricated. A carrier-to-housing gasket is available separately.
Our hand-assembled Ford 9 inch third member assemblies are made-to-order. We keep a supply of the most popular gears in stock, with most units built within 2-3 days. Our third-member units are shipped in a durable, reusable poly storage case, perfect for keeping multiple gear sets stored and ready for the track.
Make the installation of your new Posi-Traction Third Member a breeze! We've packed together some of the most commonly needed items to ease your installation with one click!
80301 Safety Data Sheet (PDF)
80301 Product Data Sheet (PDF)
(1) Speedway Ford 9 Inch Bolt-In Rear End Axle for 1964-66 Mustang
(1) 9 Inch Ford Rearend Axle Housing 3rd Member Carrier Studs
(1) Ford 9 Inch Posi Differential 3rd Member, 31 Spl, 3.50 Gear Ratio
(1) Speedway Ford 9 Inch Posi Traction Third Member Install Kit
|Differential Type||Limited Slip|
|Bolt Pattern||5 on 4.5"|
|Yoke U-Joint Series||1310|
|Sold in Quantity||Kit|