Product Summary

Ford 9 Inch, Rear Position, 57" Overall Width, Natural

  • Direct fit bare steel 9-inch Ford axle housing for your 65-66 Ford Mustang
  • Pre-welded shock mounts and stock location leaf spring pads for stock ride height
  • Includes 31 spline performance axle package with new bearings, seals, retainers, and T-bolts
  • New Big Ford style ends - accepts 2.5" offset brakes
  • Retains factory Ford 5 on 4-1/2 wheel bolt pattern with 1/2-20 thread wheel studs

Comes as a Kit

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Key Specs

MFG. Part #99046466
PositionRear
Overall Width57"
Axle Splines31
Axle TypeSemi-Floating
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Speedway Motors 99046466 Details

  • Housing length: 52-3/8 inches (from flange-to-flange)
  • Total wheel-to-wheel mounting surface width is 57-3/8 inches (from hub-to-hub)
  • Direct replacement Ford 9-inch housing rear end for your 65-66 Mustang
  • Pre-welded mounting pads retain stock leaf spring mounting location
  • Uses factory shock mounting location to retain stock shock length
  • 9-inch housing features stock 65-66 Mustang 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 come with bearings, lock rings, axle seals, and wheel studs installed
  • Axles feature 5x4.5 Ford and 5x4.75 GM car bolt patterns with 1/2-20 threaded studs

A Direct-Fit Ford 9-inch Rear End Housing for Your First Gen 65-66 Mustang

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 is probably a safe bet there are more non-Ford vehicles on the road (and track) with a Ford 9-inch rear end under 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 a 65-66 Mustang, Speedway Motors offers a bolt-in 9-inch Ford rear end housing for your build that is a direct swap for stock first gen 65-66 Mustang rear ends. This Mustang rear end housing is made from premium steel and is fully welded, including brand new “Torino” big Ford axle housing ends. The housing maintains the 65-66 Mustang rear end width and retains the stock shock mount locations as well. The axle’s leaf spring mounting pads are welded in their stock mounting location for a bolt-in solution. This allows you to retain stock ride height characteristics or you can lower the rear of your Mustang via lowering springs, lowering blocks, or other options.

Includes Fully Assembled Axles Ready for Your Differential and Center Section

Our 65-66 Ford Mustang 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 dual Chevy/Ford bolt pattern of 5 on 4-3/4 and of 5 on 4-1/2 with 1/2-20 press-in threaded studs preinstalled in the 5 on 4-1/2 Ford pattern. 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 9-inch 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 first gen 65-66 Mustang 9-inch rear end build. Replace your tired 65-66 Ford Mustang rear end with our Ford 9-inch rear end in your 65-66 Mustang while maintaining the stock rear end width and upgrade to the strength and vast options the Ford 9-inch offers.

Speedway Motors 99046466 Specifications

KEY SPECS
MFG. Part #99046466
BrandSpeedway Motors
PositionRear
Overall Width57"
Axle Splines31
Axle TypeSemi-Floating
Brakes IncludedNo
Wheel Studs IncludedYes
Wheel Bolt Pattern (in.)5x4.5 in. | 5x4.75 in.
Material TypeSteel
FinishNatural
Tube O.D.3"
Housing MaterialSteel
Hardware IncludedYes
Rotors IncludedNo
Rotor DiameterNot Included
Bolt Pattern5 on 4.5"
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

Questions & Answers

8 Questions9 Answers

Will the stock backing plates and brake drums work with this housing?

by Donald

7 years ago

1 answer

I need to install longer studs in the axle shafts. What is the knurl size required?

by Dan

7 years ago

1 answer

what is the width of the housing?

by jeremy

7 years ago

1 answer

Will I need to get a different drive shaft for my 66 with a 3 speed automatic, 289?

by Ortiz

8 years ago

2 answers

Hello I have a 1966 ford mustang 6 cylinder and currently doing a front disc conversion with a 5 lug and wanting to convert the back to 5 lug as well but keep drum brakes. Does this package come with the pinion/gear in the housing? If so. Is it already setup to the gear ratio? Thank you.

by Albert

8 years ago

1 answer

will this bolt right to my 1968 ford falcon

by keith

8 years ago

1 answer

Can these axles be set up for 4.75 chevy bolt pattern. I noticed the different bolt patterns on the picture.

by john

9 years ago

1 answer

Hello. I wondered if this housing would bolt into a 67 Mustang. I have a 57-59 housing (same width as a 66 Mustang) in the car now, and I love the tires being 'tucked in' as they currently are.

by Me

9 years ago

1 answer

8 of 8 questions shown

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