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$1,778.99
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In

Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In

Universal Fit, Rear Position, 56" Overall Width, 31 Axle Splines

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Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
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Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 56 In
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Part # 91604028
$1,778.99
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Ford 9 Inch Clutch-Style Posi Differential Third Members
Ford 9 Inch Clutch-Style Posi Differential Third Members
Quantity: 1
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Details

Position:
Rear
Overall Width:
56"
Material Type:
Steel
Finish:
Natural
Axle Splines:
31
Tube O.D.:
3"
Bolt Pattern:
Dual: 5 on 4.5" | 4.75"
Housing Material:
Steel
Wheel Studs Included:
Yes
Yoke U-Joint Series:
1310
Yoke Width:
3-7/32"
Sold in Quantity:
Kit
Brakes Included:
No
Bearings Included:
Yes
Seals Included:
Yes
Rotors Included:
No
Thread Pitch:
1/2"-20 & 7/16"-20

Info

Looking for a budget-friendly and rock-solid rearend to complete your upgraded driveline? Look no further. These fabricated steel Ford 9" rearend housing kits feature all-new components for maximum durability. This 9 inch Ford axle housing is pumpkin-centered, which will offset the pinion yoke about 1". This is done to make fabricating a triangulated 4-link system much easier. Simply weld on your preferred brackets, slip in the included 31-spline axles, install the included posi-traction 3rd member, and you have yourself a rolling chassis!

Based off of the original limited-slip designs of the OEMs, these differential units provide the added benefits of millions of miles and decades of proven reliability. Speedway has taken this engineering to the next step in performance with increased clutch pressure and holding power, suiting it well for heavy-duty street car applications. We start with a new reinforced Speedway motors carrier housing and then install bearings, seals, a heavy-duty "Daytona" pinion support, a 1310-series yoke, and your choice of ring-and-pinion ratios. The 1310-series yoke is the correct size for many Ford applications with cups 1-1/16 inch in outside diameter and a span of 3-7/32 inch across. Coupling this bulletproof foundation with our clutch style posi-traction differential provides a proven combination and a welcome alternative to locker & spool differentials which are often overkill and more expensive than the common street car requires.

Kit includes the fabricated housing, Ford 9 Inch Posi Differential 3rd Member, a pair of axle shafts with bearings and seals, 1/4" thick heavy duty retainer plates, two sizes of wheel studs (1/2"-20 Ford/Mopar and 7/16"-20 GM), 3rd member mounting hardware, and a reusable 3rd member gasket. Also included are (8) T-bolts for the axle bearing retainer plates and (10) studs for the third member.

  • New fabricated steel center section
  • New 3" O.D. axle tubes w/ 3/16" wall thickness
  • Axle tubes are internally reinforced for additional strength
  • Performance 31-spline axle shafts
  • "New Big Ford" Torino-style bearings, seals and HD retainers
  • Housing measures 51" from flange-to-flange
  • Assembled rearend measures 56" from hub-to-hub (a.k.a. axle flange face-to-face)
  • Fabrication-friendly centered pumpkin w/ 1" offset pinion yoke
  • Includes wheel studs, 3rd member studs and T-bolts for bearing retainer plates
  • Includes vent on driver side axle tube
  • Brake kits sold separately

3rd Member Installation Instructions

Notes

Additional Information:

Racing applications with 10.5” tires, drag radials or slicks are better suited for the more expensive locker and Powertrax style carrier designs.

All third members are assembled by our team of professionals and are delivered to you in a handy plastic carrying case, for an overall value that can’t be beat.

Available in your choice of 3.00, 3.25, 3.50, 3.70, 3.89, 4.11 or 4.56 gear ratio in both 28 and 31 spline.

Total wheel-to-wheel mounting surface width is 56" (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 56" housing kit includes one 28-5/8" long axle and one 26-3/8" long axle. These custom cut and splined axle shafts are manufactured from an induction heat treated 1541 forged alloy. These axles are specific to the aftermarket brake configuration standard in that they have a 2.5" brake space offset, 2.8" register hub and include late model large bearings (Torino bearings). Flanges are dual-drilled for both 5 on 4-1/2" Ford/Mopar and 5 on 4-3/4" GM wheel bolt patterns.

Gear lube recommendations:

91044090 - For street and every day driving under normal conditions

91044140 - For extreme duty, towing or very hot climates

Specs

3rd Member

  • Differential Type: Limited Slip
  • Housing Material: Cast-Iron
  • Yoke U-Joint Series: 1310
  • Yoke Width: 3-7/32"
  • U-Joint Cap Size: 1-1/16"
  • Ring Gear Weight: Standard
  • Weight: 78.55 lbs
  • Sold in Quantity: Each
  • Gear Material: Steel
Some parts are not legal for use in California or other states with similar laws/regulations

Related Products

What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • Currie CE-98129-26375 9 Inch Ford 31 Spline Axle Shaft, 26-3/8 Inch
    Qty x 1
  • Currie CE-98129-28625 9 Inch Ford 31 Spline Axle Shaft, 28-5/8 Inch
    Qty x 1
  • Speedway Fabricated Ford 9 Inch Rearend Axle Housing, 56 Inch Width
    Qty x 1
  • Speedway 9 Inch Ford Rearend Axle Housing 3rd Member Pumpkin Gasket
    Qty x 1
  • Ford 9 Inch Clutch-Style Posi Differential Third Members
    Qty x 1
  • 3rd Member Mounting Hardware, 8/9 Inch Rearend
    Qty x 1

More Like This

Reviews

Q & A

Videos & Articles
  • This article demonstrates how to install a complete Winters quick change kit with additional parts including birdcages, brackets, and calipers for a modified race car.
  • Dalton discusses a few great safety features that we offer for our customers here at Speedway Motors . We have what you need to remain safe in your race car.
  • In this Tech Tip, John responds to a customer looking to upgrade the 8” stock differential in his Cougar to a 9” open diff.

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