Product Summary

Ford 9 Inch, Rear Position, Semi-Floating Axle Type

  • Will fit 1970-1981 GM F-body
  • 9" gear ring size
  • 5 x 4-3/4" bolt pattern
  • Steel construction
  • 3" O.D. DOM 3/16" wall axle tubes

Comes as a Kit

Key Specs

MFG. Part #99007081
BrandSpeedway Motors
Axle TypeSemi-Floating

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Speedway Motors 99007081 Details

These bolt-in rear axle packages are designed to replace the original GM F-Body rearend housing and are compatible with the stock mono-leaf spring rear suspension found in your '70-'81 Camaro/Firebird. 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
  • For Mono-Leaf spring applications
  • 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 4-3/4" wheel bolt pattern
  • 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.


  • Mono-leaf spring applications (not applicable to multi-leaf spring applications)

Speedway Motors 99007081 Specifications

MFG. Part #99007081
BrandSpeedway Motors
Axle TypeSemi-Floating
Speedway Motors Catalog Part #990-07081
Differential IncludedNo
Ring Gear Size9 Inch
Axle Splines31
Housing MaterialSteel
Bolt Pattern5 on 4.75"
Wheel Studs IncludedYes
Hardware IncludedYes
Sold in QuantityKit
Bearings IncludedYes
Seals IncludedYes
Rotors IncludedNo
Thread Pitch="1/2"-20"