Product Summary

Universal Fit, Rear Position, 56" Overall Width, Gray

  • 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

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Key Specs

MFG. Part #91604028
PositionRear
Overall Width56"
Axle Splines31
Axle TypeSemi-Floating
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Need To Know

Quick and Easy Returns

Return Policy

Speedway Motors 91604028 Details

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 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).

Wefinish 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 51" from flange-to-flange
  • Assembled rearend measures 56" from hub-to-hub (axle flange face-to-face)
  • Includes one 28-5/8" long 31-spline axle and one 26-3/8" 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
  • Brake kitssold separately

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.

Charts

Speedway Motors 91604028 Specifications

KEY SPECS
MFG. Part #91604028
BrandSpeedway Motors
PositionRear
Overall Width56"
Axle Splines31
Axle TypeSemi-Floating
Brakes IncludedNo
Wheel Studs IncludedYes
Wheel Bolt Pattern (in.)5x4.5 in. | 5x4.75 in.
Material TypeSteel
FinishNatural
Differential TypeLimited Slip
Tube O.D.3"
Housing MaterialSteel
Yoke U-Joint Series1310
Hardware IncludedYes
Rotors IncludedNo
Rotor DiameterNot Included
Bolt Pattern5 on 4.5" | 4.75"
GENERAL
Sold in QuantityKit
Axle Shafts IncludedYes
Third Member IncludedYes
Ring and Pinion IncludedYes
Wheel Stud Thread Size1/2"-20
Bearings IncludedYes
Seals IncludedYes
Differential IncludedYes
Ring Gear Size9 Inch
Yoke Width3-7/32"
Housing ColorGray
Cut to FitNo
Standard Pinion LocationOffset Pinion / Centered 3rd Member

Ratings & Reviews

5

10 Reviews

Overall Assessment

Customers consistently rate this product highly for its excellent quality and practical use in automotive modifications. Notably, it is simple to assemble, catering to the needs of vintage Model A and Ford enthusiasts. Its durability and performance outshine rival offerings, with regular recommendations for repeated purchases, solidifying its value and acceptance.

5

10 reviews

5

10

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Filter by Ratings

Quality product, as described

5.0

3 months ago

Ferg

Antigo, WI

Verified

Narrowed 9", going in a 1950 Ford Custom Tudor. Great fitment.

Would Recommend

Great product, high quality

5.0

4 months ago

Ferg

Antigo, WI

Verified

Very nice welds, as described dimensions. Quality product

Would Recommend

would buy again

5.0

11 months ago

Pete

mineral point mo.

Verified

under 65 Stude gasser with 4 link and coilovers

Would Recommend

Everything you need

5.0

a year ago

Todd

Dexter ks

Verified

Great price, everything you'll need but the fluid

Would Recommend

I would buy this agsin

5.0

a year ago

Vic

Whittier,Ca

Verified

Used on a 1950 shoebox custom ford

Would Recommend

Newbee

5.0

a year ago

Troy

Denver, Co

Verified

New to the company. Great communication. Will be doing business again.

Excellent product

5.0

2 years ago

Hotrod

Tn

Verified

Great product

Would Recommend

I would definitely buy again

5.0

3 years ago

Bobby

Texas

Verified

Used in a '29 Model A

Would Recommend

I would definitely buy this product again

5.0

4 years ago

Dan trom

Blooming Prairie Minnesota

Verified

Very nice easy to assemble kit

Would Recommend

My mech would buy this product again.

5.0

6 years ago

A. Wallace

Coldwater, MS

Verified

Fills the need to fix my 1953 Ford.

Would Recommend

Showing 10 of 10 reviews

Questions & Answers

1 Question1 Answer

What is the width of the housing

by Craig

3 years ago

1 answer

1 of 1 questions shown

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