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Speedway Ford 9 Inch Bolt-In Rear End Axle for 1979-93 Mustang
Speedway Ford 9 Inch Bolt-In Rear End Axle for 1979-93 Mustang

Speedway Ford 9 Inch Bolt-In Rear End Axle for 1979-93 Mustang

Ford 9", Rear Position, Semi-Floating Axle Type, Not Differential Included, 31 Axle Splines

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Speedway Ford 9 Inch Bolt-In Rear End Axle for 1979-93 Mustang
Speedway Ford 9 Inch Bolt-In Rear End Axle for 1979-93 Mustang
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We estimate this item will ship on or before June 29th.
Part # 99047993
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Axle Type:
Differential Included:
Ring Gear Size:
9 Inch
Axle Splines:
Bolt Pattern:
5 on 4.75"
Sold in Quantity:
MFG. Part #:


These bolt-in rear axle packages are designed to replace the original '79-'93 Mustang rearend housing and are compatible with the stock trailing arm rear suspension found in your Fox body Mustang. The major advantages gained by upgrading to a Ford 9" axle include a) greatly increased strength (reliability), b) the variability of the housing to accept almost any gear ratio from 2.47:1 to 6.14:1, c) a drop-out third member for ease of service, and d) steel axle retainers keep the axle/wheel in place in the event of axle failure. Here are the features you'll find in our fabricated Ford 9 Inch axle kits:

  • New stamped steel housing center piece
  • New billet steel housing ends with oil seal surface ("Big New Ford" Torino-style)
  • 3" O.D. DOM 3/16" wall axle tubes
  • 31-spline axles w/ bearings, studs & retainers
  • 1/2"-20 wheel studs, 2" long
  • 5 x 4-1/2" wheel bolt pattern
  • Hardware kit for assembly (center section studs/nuts/washers, T-bolts and vent fitting)
  • Jig welded suspension brackets for stock style suspension
  • Built to stock width

Add third member and brake kit of your choice (both sold separately) to complete your installation.

Some parts are not legal for use in California or other states with similar laws/regulations

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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.
  • 79-93 Fox Body 9" Housing Only
    Qty x 1
  • 79-93 Fox Body 9" Axles Only
    Qty x 1

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