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#91604030
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 60 In
- 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
$2,263.99
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$2,298.44
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Product Summary
Universal Fit, Rear Position, 60" 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
View Kit Components
Key Specs
| MFG. Part # | 91604030 |
| Position | Rear |
| Overall Width | 60" |
| Axle Splines | 31 |
| Axle Type | Semi-Floating |
Need To Know
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Speedway Motors 91604030 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 55" from flange-to-flange
- Assembled rearend measures 60" from hub-to-hub (axle flange face-to-face)
- Includes one 30-5/8" long 31-spline axle and one 28-1/4" 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
- 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 91604030 Specifications
Speedway Motors 91604030 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91604030 |
| Brand | Speedway Motors |
| Position | Rear |
| Overall Width | 60" |
| Axle Splines | 31 |
| Axle Type | Semi-Floating |
| Brakes Included | No |
| Wheel Studs Included | Yes |
| Wheel Bolt Pattern (in.) | 5x4.5 in. | 5x4.75 in. |
| Material Type | Steel |
| Finish | Natural |
| Differential Type | Limited Slip |
| Tube O.D. | 3" |
| Housing Material | Steel |
| Yoke U-Joint Series | 1310 |
| Hardware Included | Yes |
| Rotors Included | No |
| Rotor Diameter | Not Included |
| Overall Length | 60" |
| Bolt Pattern | 5 on 4.5" | 4.75" |
| GENERAL | |
| Sold in Quantity | Kit |
| Axle Shafts Included | Yes |
| Third Member Included | Yes |
| Ring and Pinion Included | Yes |
| Wheel Stud Thread Size | 1/2"-20 |
| Bearings Included | Yes |
| Seals Included | Yes |
| Differential Included | Yes |
| Ring Gear Size | 9 Inch |
| Yoke Width | 3-7/32" |
| Housing Color | Gray |
| Cut to Fit | No |
| Standard Pinion Location | Offset Pinion / Centered 3rd Member |
Ratings & Reviews
4.5
8 Reviews
Based on customer reviews, the product consistently delivers on quality and practicality. The components are well-manufactured and assembled, ensuring a clean, exact fit. This product stands out in terms of reliability, with users even replacing OEM parts for our superior axle assembly. The addition of compatible parts like the disc brake kit was praised for improving performance. In comparisons, customers highly recommend our product for its superior quality and reliability.
Ratings & Reviews
4.5
8 Reviews
Based on customer reviews, the product consistently delivers on quality and practicality. The components are well-manufactured and assembled, ensuring a clean, exact fit. This product stands out in terms of reliability, with users even replacing OEM parts for our superior axle assembly. The addition of compatible parts like the disc brake kit was praised for improving performance. In comparisons, customers highly recommend our product for its superior quality and reliability.
4.5
8 reviews
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Filter by Ratings
yes its great
5.0
2 months ago
Hank
72006
Verified
put it in a 1955 f100 truck loos great just ran in to the brake kit i order from you as well don't fit without having to do some machining work to get the rotors over the axles
Would Recommend
Great deal for loaded rearend
5.0
10 months ago
Ss
Fresno
Verified
Used on my hot rod welded mounts and powder coating then assembled
Would Recommend
Just what I needed
4.0
a year ago
Rpc
Zachary la
Verified
Changed rear end in 1954 chevy truck. Worked out as expected. 3rd member studs were an issue. When you pull them into housing they did not pull straight. Had to move to get third member to align. Also gasket bolt holes were off a little. But with work it is installed.
Would Recommend
Yes
5.0
2 years ago
54
Calgary Alberta CA
Verified
Good quality
Would Recommend
Super Heavy Duty
5.0
3 years ago
Mikes Metal Worx
Covina, CA
Verified
like how well the parts are manufactured and assembled. Very clean.
Would Recommend
Yes
4.0
3 years ago
Big man
Idalou texas
Verified
To this point everything is working out well
Would Recommend
9" Rear axle assembly
3.0
5 years ago
Fun Car
Carver, MN
Verified
Swapping out the OEM axle assembly for reliability. The cons mentioned were satisfactorily resolved with one call to the Customer Service team - Kalley (sp?). She was very savvy about the situation and needs. Speedway supplied studs to solve the problem and I'll simply tap the holes for the 7/16" - 14 end of the stud and the other end is 3/8" - 24 which fits the differential carrier housing. I agreed to use the grade 8 capscrews for the brake mounting rather than t-bolts.
Would Recommend
They say you have to go 9" Ford so I did
5.0
6 years ago
Lee 54 low and fun
st paul park
Verified
I added the disc brake kit works very well together
Would Recommend

Showing 8 of 8 reviews
Questions & Answers
2 Questions • 2 Answers
Questions & Answers
2 Questions • 2 Answers
What is the axle tube diameter? I don't see it listed.
by Jack
• 4 years ago
1 answer
View Answer
can we get this unit with a 4 hole lug axle? I want to keep the original wheels on this falcon that I am restoring. Also would like to know about shipping cost. to my location
by Roger
• 5 years ago
1 answer
View Answer
2 of 2 questions shown

