1968-72 GM A-body Ford 9 Inch Rear Axle Kit, 3.50:1

Axles and Housing

These bolt-in rear axle packages are designed to replace the original ’68-’72 GM A-Body rearend housing and are compatible with the stock 4-link trailing arm rear suspension found in your Chevelle/Malibu/El Camino/Sprint/GTO/LeMans/Tempest/F85/Cutlass/442/Special/Skylark/Gran Sport. The major advantages gained by upgrading to a Ford 9″ axle include a) greatly increased strength (reliability), b) the variability of the housing to accept almost any gear ratio from 2.47:1 to 6.14:1, c) a drop-out third member for ease of service, and d) steel axle retainers keep the axle/wheel in place in the event of axle failure. Here are the features you’ll find in our fabricated Ford 9 Inch axle kits:

New stamped steel housing center piece
New billet steel housing ends with oil seal surface (“Big New Ford” Torino-style)
3″ O.D. DOM 3/16″ wall axle tubes
31-spline axles w/ bearings, studs & retainers
Axles have 2.5″ of offest on each side
1/2″-20 wheel studs, 2″ long
5 x 4-3/4″ wheel bolt pattern
Jig welded suspension brackets for stock style suspension
Built to stock width
Works with most aftermarket coil-over conversion kits

Housing Studs

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 ”

Third Member

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

919-0916 Speedway 3rd Member Mounting Hardware for 8/9 Inch Rearends
Used to attach the 3rd member (pumpkin) to the rearend housing
Works with Ford 8″ and 9″ rear axles
Includes aluminum washers
919-2300 Speedway 9 Inch Ford Rearend Axle Housing 3rd Member Pumpkin Gasket
Reusable Differential Gasket
Steel Core
Non-Stick Coating
910-48319 Universal Drive Shaft U-Bolts, 1-1/16 Inch Cap
Speedway universal drive shaft U-bolts are forged steel for 50% more strength than standard units
Fits U-joints with 1-1/16″ diameter caps
U-bolt set for #80292417 – Speedway Ford 9 Inch Rearend 1310-Series Small Pinion Yoke
From end of threads to inside of radius at deepest point is 1.708″ or 1-11/16″ plus
Center to center of threaded ends is 1-3/8″
795-9751 Valvoline VV975 Synpower 75W90 Gear Oil, 3 Quarts
Thermally stable, extreme-pressure gear lubricant
Designed to operate in both high and low extreme-temperature conditions
Recommended for limited-slip hypoid differentials and is compatible with conventional gear lubricants
Maintains excellent low-temperature fluid protection
Provides outstanding thermal stability for cleanliness and longer service life
Contains special additives to assist in protecting gear teeth from rust and corrosion
Contains special additives to reduce chattering in limited-slip differentials
3 quarts
60780301 Red Line 80301 Limited-Slip Friction ModifierAdditive, 4 oz.
Compatible with both petroleum and synthetic gear oils
Reduces break-in temps as much as 50°F
Add 1oz at a time to clutch-type limited slip or posi-traction units to eliminate chatter
Exceeds API GL-5 specifications
Engineered to provide the highest degree of protection and efficiency for better mileage, longer drain intervals, and less wear
4 ounce bottle
Recommended Dosage:
Use 4% for prevention of limited slip chatter in broken-in units (typical one 4 oz. bottle) or 4 to 8% for the break-in of new differentials.
In non-limited-slip racing differentials and quick-change units using the Red Line ShockProof Gear Oils an additional 3 to 6% Red Line Limited-Slip Differential Friction-Modifier / Break-In Additive is recommended.
Kit Includes

(1) Speedway Ford 9 Inch Bolt-In Rear End Axle for 1968-72 GM A-Body

(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