Product Summary

Universal Fit, Rear Position, Semi-Floating Axle Type

  • A complete Ford 9 inch rear end assembly, built in-house from high-quality components
  • Stronger, fabricated steel housing with forged 31-spline axles
  • Precision assembled third member with nodular iron housing in your choice of gear ratios
  • Clutch style positraction differential gives limited slip performance and quiet operation (no gears clicking!)
  • Includes all necessary hardware and gaskets for a complete installation

Comes as a Kit

Key Specs

MFG. Part #91604027
BrandSpeedway Motors
Axle TypeSemi-Floating

Need To Know

Quick and Easy Returns

Return Policy


Save the time and headache of choosing the right parts for your Ford 9 inch rear end assembly and let the experts choose a quality, hand-assembled, street-tough complete package for you at an unbeatable value. 

Stronger, Fabricated Steel Axle Housing with Forged Axles 

Designed for your restoration, upgrade or custom build we start with our USA-made, NEW fabricated steel axle housing. Our housing design is pumpkin-centered and improved with two points of support on the axle tubes to reduce tube flex, instead of support only on the single weld point of traditional stamped steel housings. A greater-than-stock capacity center section holds more gear oil and runs cooler. This housing includes (8) T-bolts for the axle bearing retainer plates and (10) studs for the third member. And yet, while improving strength, we have made our axle housings on average, 2 pounds lighter than stock style housings.  

Fitted with “New Big Ford” (Torino)-style bearings and a 3” O.D. axle tubes, this housing also includes forged steel axles, bearings, seals and retainers. Flanges are dual-drilled for both 5 on 4-1/2" Ford/Mopar and 5 on 4-3/4" GM wheel bolt patterns and includes two sizes of wheel studs (1/2"-20 Ford/Mopar and 7/16"-20 GM). 

We finish off the axle assembly with Forged 1541 Steel Currie Enterprises axles. 

Learn more about the superior design and benefits of our fabricated Ford 9 inch rearend axle housing kit.  

  • 3" O.D. axle tubes with 3/16" wall thickness  
  • Billet steel "New Big Ford" (Torino) style bearing ends  
  • Forged Currie Enterprises 1541 Steel axles, dual drilled for both 5 on 4-1/2" Ford/Mopar and 5 on 4-3/4" GM wheel bolt patterns.  
  • 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 27-5/8" long 31-spline axle and one 25-1/4" long 31-spline axle
  • 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  
  • Includes vent on driver side axle tube  
  • Includes studs for 3rd member and 3/8” T-bolts for bearing retainer plates 

Precision Built Third Member with Nodular Iron Carrier Housing 

Our third member assemblies are precision assembled, in house by our trained technicians with new, quality components. You choose the gear ratio and we take care of the rest. We start with a new carrier housing, re-designed and constructed of reinforced nodular (ductile) iron that is far stronger than OEM ‘gray’ cast iron housings. Nodular iron resists fracturing far better than traditional gray iron and is the metal of choice for the demands of high horsepower and torque. Machined surfaces and a Viton® pinion seal keep the leaks off your shop floor.  

We have reinforced the rearmost pinion (pilot bearing) support and use a large “Daytona” nodular iron pinion bearing support with a spacer and shim assembly to maintain perfect pinion gear alignment and long life. The spacer/shim stack gives durability and ease of service. The larger oiling channels of the Daytona bearing support also add to long bearing life. We included a NEW, forged steel 1310-style "Short Ford" pinion yoke to round off this durable assembly. 

Ring and pinion gears are built of long-wearing 8620 cold-rolled steel and assembled with Grade 9 hardware with Grade 8 carrier cap bolts. Billet steel adjuster nuts and heavy-duty keepers ensure your ring gear settings are maintained.  

See how our third members assemblies are an unbeatable combination of value and quality

  • Precision assembly for the correct backlash, preload, and proper amount of pinion shims to ensure the correct pattern on the ring gear teeth  
  • Nodular iron housing is stronger than OEM “gray” iron and has 4 lbs of additional reinforcement 
  • Large bearing “Daytona” style pinion bearing supports for strength and reliability 
  • New forged steel 1310-style "Short Ford" pinion yoke
  • U-Joint Cap Size: 1-1/16, Yoke Width: 3-7/32"
  • Spacer and shim setup maintains critical pinion depth settings and easier to service than traditional crush sleeves 
  • Gear units built of long-wearing 8620 cold-rolled steel, available in your choice of gear ratio
  • Ring gears assembled with Grade 9 hardware, 15% stronger in tensile strength than Grade 8 
  • Viton® pinion seal, resistant to chemicals and high temperatures 
  • Grade 8 Carrier cap bolts 
  • Lock-style pinion nut with pre-applied Loctite® 
  • Grade 5 pinion support bolts 

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.   

  • Clutch style, spider gear differential = proven reliability 
  • Spring-loaded clutch pack with improved grip over OEM designs 
  • Ideal for street tires and medium horsepower applications 
  • Housed in a Fully Machined, Reinforced Forged Steel Case 

This kit comes supplied with all necessary hardware and gaskets for a complete install.

Save time, money and be comfortable knowing you have a first-rate, hand assembled complete Ford 9 inch rearend assembly with our complete axle housing, axle and third member kit. 



MFG. Part #91604027
BrandSpeedway Motors
Axle TypeSemi-Floating
Overall Width54.00"
Differential IncludedYes
Differential TypeLimited Slip
Material TypeSteel
Tube O.D.3"
Housing MaterialSteel
Bolt Pattern5 on 4.5" | 4.75"
Wheel Studs IncludedYes
Yoke U-Joint Series1310
Yoke Width3-7/32"
Sold in QuantityKit
Brakes IncludedNo
Bearings IncludedYes
Seals IncludedYes
Rotors IncludedNo
Thread Pitch