Speedway Centered Housing Axle Kit, 54 Inch Width, Fits Ford 9 Inch

Our fabricated steel Ford 9 inch axle housings feature all-new components for maximum durability, The housing is pumpkin-centered with uniform-length axle tubes side-to-side, so mounting suspension brackets is much easier, Unlike factory stamped housings, these fabricated plate-steel center sections provide a wide, flat surface for easy bracket attachment, In addition to the heavy-duty bearing ends, the axle tubes are supported with bracing inside the large center housing. This reduces flex in the rear end housing, which is something you won\'t find on stamped factory 9 inch housings, These improved axle housings deserve equally strong axles to drive your street machine. Two axles made of alloy steel have the strength to handle the horsepower Speedway Centered Housing Ford 9 Inch Axle Kit, 54 Inch Width Sku # 91604092 Mfr. Part # 91604092 Condition New Brand Speedway Motors Sold Kit Details

Looking for a budget-friendly, rock-solid foundation for your custom rear suspension? Look no further. Our fabricated steel Ford 9 inch axle housings feature all-new components for maximum durability. It’s an evolution of the rugged and reliable 9 inch Ford platform.

Designed with the Builder in Mind

This housing is pumpkin-centered with uniform-length axle tubes, side-to-side. So mounting suspension brackets, especially on triangulated 3-link and 4-link systems, is much easier. Unlike factory stamped housings, these fabricated plate-steel center sections provide a wide, flat surface for easy bracket attachment. Note that the pumpkin-centered design will offset the pinion yoke about 1\" to the passenger side.

Axle tubes are 3” O.D. with a 3/16” wall thickness. Heavy-wall tubes, along with a larger center section, significantly reduce distortion during welding of rear-link brackets or spring pads. Billet steel “New Big Ford” (Torino) style bearing ends are fixture-welded (3.150” O.D. bearing, with 2.50” axle flange offset).

Improved Design for Greater Durability 

In addition to the heavy-duty bearing ends, the axle tubes are supported with bracing inside the large center housing. This reduces flex in the rear end housing, which is something you won’t find on stamped factory 9 inch housings. Plus, gears stay well-lubed and run cooler thanks to a large-capacity fabricated center (holds more gear oil than stamped housings). Axle is vented on the driver’s side.

Yet, with improved durability, our fabricated axle housing is on average 2 pounds lighter than stock style housings of the same size! Add your choice of axle shafts and third member (sold separately), and you are ready to roll. Equip your race car, hot rod or 4X4 with Ford 9 inch parts from Speedway Motors to ensure there are no weak links in your driveline combination. 

Total wheel-to-wheel mounting surface width is 54\" (from hub-to-hub). The pumpkin is centered in the housing, which puts the pinion 1\" offset from center, requiring different length axle shafts. This 54\" axle kit includes 2 cut to fit axles that will require one 27-5/8\" long axle and one 25-1/4\" long axle. This housing includes (8) T-bolts for the axle bearing retainer plates and (10) studs for the third member.

Steel Axles

Our improved axle housings deserve equally strong axles to drive your street machine. Two axles made of alloy steel have the strength to handle the horsepower. Axles are 31-spline, includes axle bearings, axle seals, and bearing retainers. Flanges are drilled for both 5 on 4-1/2\" Ford/Mopar, 5 on 4-3/4\" GM, 5 on 5\" GM Truck wheel bolt patterns.

• Fabricated steel center section
• 3\" O.D. axle tubes with 3/16\" wall thickness
• Axle tubes are internally reinforced for additional strength, less flex
• Billet steel \"New Big Ford\" (Torino) style bearing ends
• Forged Steel axle, drilled for 5 on 4-1/2\" Ford/Mopar, 5 on 4-3/4\" GM car, and 5 on 5\" GM Truck Bolt patterns using 0.685\" knurl diameter
• Street application 1/2\" thread wheel studs sold separately 
• Accepts brake kits for 2.50\" axle shaft flange offset (from housing flange)
• Housing measures 49\" from flange-to-flange
• Assembled rearend measures 54\" from hub-to-hub (axle flange face-to-face)
• Includes one 33\" long axle and one 29-1/2\" long axle (axles are cut to fit)
• Improved housing design weighs approximately 2 lbs less than stock-style fabricated housings
• Centered pumpkin w/ 1\" offset pinion yoke for easy suspension mock-up
• Greater-than-stock capacity center section holds more gear oil and runs cooler
• Requires different length axle shafts, left/right
• Includes vent on driver side axle tube
• Includes studs for 3rd member and 3/8” T-bolts for bearing retainer plates
• 3rd member sold separately

For more information on determining the proper axle length and the Ford 9 Inch, be sure to check out our tech articles; Measure and ID Axles and Housings and 

Specs Sold in Quantity Kit MFG. Part # 91604092 Position Rear Overall Width 54" Axle Shafts Included Yes Axle Splines 31 Axle Type Semi-Floating Brakes Included No Third Member Included Yes Ring and Pinion Included Yes Wheel Studs Included No Wheel Stud Thread Size 1/2"-20 Wheel Bolt Pattern (in.) 5x4.5 in. | 5x4.75 in. Bearings Included Yes Seals Included Yes Differential Included No Material Type Steel Finish Natural Ring Gear Size 9 Inch Differential Type Limited Slip Tube O.D. 3" Housing Material Steel Hardware Included Yes Rotors Included No Rotor Diameter Not Included Housing Color Gray Cut to Fit No Standard Pinion Location Offset Pinion / Centered 3rd Member Bolt Pattern 5x4.5 | 5x4.75 | 5x5 Reviews This time I made a smarter choice! Rated by Jd on October 13, 2026

Summary: After doing the work to narrow my own rear end housing several times… I chose to purchase a nice New # straight, perfectly set up one from Speedway and I'm very happy I did! I will definitely buy from Speedway again and again… Thank you for your commitment to quality and cost control!

Yes, I recommend this product.

Related Items / Suggested Parts Tanks REFD Rear End Filler and Drain Kit Dorman 610-446 1/2-20 x 1.9 Inch Press-In Wheel Studs, .685 Knurl Moroso 46190 Press-In Wheel Studs, 1/2-20 x 3 Inch, .685 Inch Diameter Speedway Fabricated Ford 9 Inch Rearend Axle Housing Kit, 54 In. Width Tech Support We\'re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.