Fabricated 9 In Ford Rear Axle w/ Posi Traction 3rd Member, 54 In

Details

Position:

Rear

Overall Width:

54"

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

Picking out all the right pieces to a complicated puzzle is tough - save some valuable time and money with Speedway Motors. Our expert tech staff assembled these kits to help you get the parts you need and get back to work on your favorite hotrod!

(1) Speedway Fabricated Ford 9 Inch Rearend Axle Housing, 54 Inch Width

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. For this 54" housing you will need 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.

New fabricated steel center section
New 3" O.D. axle tubes w/ 3/16" wall thickness
Axle tubes are internally reinforced for additional strength
New billet steel "New Big Ford" style bearing ends (a.k.a. bearings w/ 2.50" axle shaft flange offset from housing flange)
Housing measures 49" from flange-to-flange
Assembled rear end measures 54" from hub-to-hub (a.k.a. axle flange face-to-face)
Centered pumpkin w/ 1" offset pinion yoke
Requires different length axle shafts, left/right
Includes studs for 3rd member and T-bolts for bearing retainer plates
Includes vent on driver side axle tube

(1) Ford 9 Inch Posi Differential 3rd Member

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.

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.

Clutch style, spider gear differential = proven reliability
Forged steel case
Heat-treated spider gears
Quiet operation, no clicking when disengaging for corners
Spring-loaded clutch pack with improved grip over OEM designs
Ideal for street tires and medium horsepower applications

(1) Currie 9 Inch Ford 31 Spline Axle, 27-5/8 Inch

(1) Currie 9 Inch Ford 31 Spline Axle, 25-1/4 Inch

Dual drilled bolt pattern

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

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 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" housing kit includes one 27-5/8" long axle and one 25-1/4" 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-98129-27625 9 Inch Ford 31 Spline Axle Shaft, 27-5/8 Inch

Part # 91046009

Qty x 1
Currie CE-98126-25250 9 Inch Ford 31 Spline Axle Shaft, 25-1/4 Inch

Part # 91046008

Qty x 1
Speedway Fabricated Ford 9 Inch Rearend Axle Housing, 54 Inch Width

Part # 91046254

Qty x 1
Speedway 9 Inch Ford Rearend Axle Housing 3rd Member Pumpkin Gasket

Part # 9192300

Qty x 1
Ford 9 Inch Clutch-Style Posi Differential Third Members

Part # 91049345

Qty x 1
3rd Member Mounting Hardware, 8/9 Inch Rearend

Part # 9190916

Qty x 1

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