Product Summary

Rear Position, 63.5" Overall Width, 31 Axle Splines

  • Direct fit 9-inch Ford axle housing for your square body Chevy truck
  • Pre-welded shock mounts and stock location leaf spring pads for stock ride height
  • Includes 31 spline performance axle (lengths of 29-1/4" & 32-3/4") package with new bearings, seals, retainers, and T-bolts
  • Retains factory GM 5 on 5 wheel bolt pattern with 1/2-20 thread wheel studs
  • Simply add your choice of drum or disc brakes and 3rd member to complete your 9-inch axle swap

Comes as a Kit

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Key Specs

MFG. Part #99073870
PositionRear
Overall Width63.5"
Axle Splines31
Axle TypeSemi-Floating
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Speedway Motors 99073870 Details

  • Housing length: 58-1/2 inches (from flange-to-flange)
  • Spring perch center-to-center: 42 inches
  • Total wheel-to-wheel mounting surface width is 63-1/2 inches (from hub-to-hub)
  • Direct replacement Ford 9-inch housing rear end for your GM 1/2-ton truck rear
  • Pre-welded mounting pads retains stock spring over axle mounting location
  • Uses factory staggered shock mounting location to retain stock shock length
  • 9-inch housing features stock 73-87 C10 rear end width flange to flange for perfect fit
  • Works with any Ford 9-inch housing center section (sold separately)
  • Big Ford new style “Torino” axle flange accepts drum or disc brakes
  • New 31 spline axles (lengths of 29-1/4" & 32-3/4") come with bearings, lock rings, axle seals, and wheel studs installed
  • Axles feature 5x5 GM 1/2-ton truck bolt pattern with 1/2-20 threaded studs

A Direct-Fit Ford 9-inch Rear End Housing to Start Your Square Body C10 Build

There is certainly no denying the popularity of Ford’s venerable 9-inch rear axle when it comes to high performance street and racing applications. It’s probably a safe bet there are more non-Ford vehicles on the road (and track) with a Ford 9-inch rear end under the rear of them than Ford ever shipped off their assembly lines! That is saying a lot right there. From the stronger housing design to the huge aftermarket support in axles, differentials, ring and pinion gears, and more, the Ford 9-inch rear end is the performance axle housing to use, without a doubt.

For those building up the 1973-1987 C10 pickup, known to many by the “square body Chevy” moniker, Speedway Motors offers a bolt-in 9-inch Ford rear end housing for your build that is a direct swap for the stock Chevy truck rear end. This housing is made from premium steel and is fully welded, including brand new “Torino” big Ford axle housing ends. The housing maintains the 73-87 C10 rear end width for the 3rd generation Chevy pickup and retains the stock shock mount locations.

The axle’s leaf spring mounting pads are affixed in their stock “spring over axle” top mounting location. This allows you to retain stock ride height characteristics or you can lower the rear of your square body Chevy via lowering springs, shackles, or other options. We do offer our 9-inch Ford rear end housing with flipped leaf spring pad location as well if you’re looking to do an axle flip the right way to gain a 4-6 inch drop in the rear of your square body Chevy.

Includes Fully Assembled Axles Ready for Your Differential and Center Section

Our C10 9-inch rear end housing package includes strong 31-spline performance axles with bearings and bearing lock rings already pressed into place on the axles. The axles feature the standard 1/2-ton truck 5 on 5 bolt pattern with 1/2-20 press-in threaded studs pre-installed as well. Finally, we include the axle retainer brackets and the correct 9-inch T-bolts and nuts to secure the axles and your drum or disc brake kit of choice.

Additional hardware includes 10 press-in studs with nylon locking nuts for the main housing to center section assembly, and a screw in axle vent fitting. All your new Ford 9-inch housing needs for completion is a complete center section with your choice of differential and gearing and drum or disc brake package. Our complete 9-inch 3rd members are the perfect choice to finish your C10 9 inch rear end to replace your tired Chevy truck rear end with our Ford 9-inch rear end in your square body Chevy while maintaining the stock 73-87 C10 rear end width.

Speedway Motors 99073870 Specifications

KEY SPECS
MFG. Part #99073870
BrandSpeedway Motors
PositionRear
Overall Width63.5"
Axle Splines31
Axle TypeSemi-Floating
Brakes IncludedNo
Wheel Studs IncludedYes
Wheel Bolt Pattern (in.)5x5 in.
Material TypeSteel
FinishNatural
Tube O.D.3"
Housing MaterialSteel
Hardware IncludedYes
Rotors IncludedNo
Rotor DiameterNot Included
Bolt Pattern5 on 5"
Shaft Diameter1.3125"
GENERAL
Sold in QuantityKit
Notes1/2"-20 wheel studs, 2" long, 0.685" knurled
Axle Shafts IncludedYes
Third Member IncludedNo
Ring and Pinion IncludedNo
Wheel Stud Thread Size1/2"-20
Bearings IncludedYes
Seals IncludedYes
Differential IncludedNo
Ring Gear Size9 Inch
Housing ColorNatural
Cut to FitNo
Standard Pinion LocationCentered Pinion / Offset 3rd Member
Shaft Length32.25"

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I would recommend this axel

5.0

4 months ago

mib7483

Utah

Verified

This bolted right in to my project. I installed it in a 78 C10 that will have a 56 Chevy 3100 swapped on to it.

Would Recommend

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Questions & Answers

1 Question • 1 Answer

What is the axle flange offset

by Kyle

• 3 years ago

1 answer

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