Product Summary

Ford 8 Inch, Ford 9 Inch, Rear Position, Natural

  • Disc brake stopping power for your Ford 9 inch or 8 inch rearend at nearly the same cost as rebuilding/replacing drum brakes
  • Kits includes two bolt-on caliper brackets, two 11-1/4" vented rotors, two GM metric style calipers (non-emergency brake), brake pads and hardware for increased stopping power
  • Fits over an axle with maximum flange diameter of 6-1/4" O.D.
  • Rotors have a 2.80" center hole which fit Currie axles with both 5 on 4-1/2" and 5 on 4-3/4" bolt circles
  • Fits "old" and "new" style big bearing (3.150" bearing O.D.) Ford housings and with axle offsets of a minimum 2-3/8" to 2-1/2"

Comes as a Kit

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Key Specs

MFG. Part #91032007
PositionRear
Wheel Bolt Pattern (in.)5x4.5 in. | 5x4.75 in.
Wheel Bolt Pattern (mm)5x114.3 mm | 5x120.65 mm
Rotor Diameter11.25 Inch
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Speedway Motors 91032007 Details

Disc Brake Stopping Power at a Great Value

This economical disc brake kit for Ford 9 inch and 8 Inch axles is simple to install and provides big stopping power, at a price nearly the same as replacing original drum brakes. That Ford rear end handles the power to make it go, but these binders clamp down when you say whoa! Today’s average family sedan can stop from 60 MPH in 120 feet, at nearly 1G of deceleration. You need the same stopping power. Your passengers, you and your car deserve the confidence of disc brakes and our kit delivers that confidence with exceptional value.

Superior to Drum Brakes

Aftermarket disc brakes are superior to original drums in many ways: more braking force, less brake fade, and easier service. Stopping power starts with our newly manufactured GM Metric D154 style single piston calipers, commonly found on 1978-88 GM G-Body and A-Body cars. Large 11-1/4” diameter, 1” thick vented rotors provide more stopping leverage than common 9” or 10” drum brakes. Brake pads are easier to change than drum shoes, and our brake kit includes a street-friendly organic compound for long rotor/pad life. Replacement pads are common sized, available from your local auto parts store. Looking for more aggressive stopping power? We carry race-grade D154 disc brake pads that drop in just as easily.

Fits Ford 9 Inch and 8 Inch Housings

This disc brake kit fits Ford 8 inch axles, as well as passenger car Ford 9 inch axle housings with “big bearing” ends (3.150” O.D. bearing, found on passenger cars from 1974-79). Included bracketry will adapt this kit to both “new style” and “old style” Ford 9 inch housing flanges with the 3/8” bearing retainer bolt holes. Bracket spacers are also included, allowing this kit to work with axle flange offsets of 2-3/8” or 2-1/2” common on Ford 9 inch passenger car rear ends. Axle flange offset is measured from the axle housing flange face (with bearing retainer removed) to the axle shaft flange face (side where the brake rotor/drum rides, including the thickness of the axle flange). 

Hardware and Instructions Included

Kit includes a detailed, step-by-step instruction sheet with images. The floating calipers include new Grade 5 slider bolts, with all remaining hardware of Grade 8 quality. Cast iron rotors feature a dual bolt pattern in 5x4.5” (Ford/Mopar/AMC) or 5x4.75” (Chevy/GM) to match your desired wheel hub pattern. Plus, this assembly will clear most 15” diameter wheels designed with disc brakes in mind. Note that there are no provisions for a parking brake, making this the perfect disc brake conversion kit for the budget-focused builder who prefers a basic upgrade kit.

  • Disc brake stopping power at nearly the same cost as rebuilding/replacing drum brakes
  • 11-1/4” diameter, 1” thick vented cast iron rotors dissipate heat faster than drum brakes
  • Serviceable design ensures good drivability and piece-of-mind when on the road
  • Street-friendly GM D154 style pads, replacements available nearly everywhere
  • GM “Metric” style single piston calipers with 7/16”-20 banjo-style inlets
  • Fits Ford “big bearing” 9 inch housings from passenger cars and 8 inch rear ends
  • Use with Ford 9 inch rear ends with 2-3/8” or 2-1/2” axle flange-to-housing offsets
  • Dual wheel bolt patterns covering all GM/Ford/Mopar (5x4.5” for 1/2” studs, 5x4.75” for 7/16” studs)
  • Use with 15” or larger disc brake-style wheels
  • Easy bolt-on installation w/ included instruction sheet
  • Includes heavy steel mounting brackets, Grade 8 hardware and nylock nuts (everything you need)
  • Rotor register/center hole is 2.80" to fit Currie axles

Specs

This kit is an aftermarket solution.  It is not intended to be a direct installation or OEM replacement.  Due to changes in production in certain years, your application may require modifications beyond the instructions for this kit to install properly.   If your axle shaft flange or axle shaft register exceeds the diameter that clears the rotor dimensions, you will need to machine the axle flange and/or the rotor to clear the diameter required.

 

Speedway Motors 91032007 Specifications

KEY SPECS
MFG. Part #91032007
BrandSpeedway Motors
PositionRear
Wheel Bolt Pattern (in.)5x4.5 in. | 5x4.75 in.
Wheel Bolt Pattern (mm)5x114.3 mm | 5x120.65 mm
Rotor Diameter11.25 Inch
Rotor TypeVented
Caliper PistonsOne
Caliper FinishNatural
Parking Brake ProvisionNo
Minimum Recommended Wheel Diameter15 Inch
Rotor ShapeRound
Hardware IncludedYes
Rotor StylePlain Face
Front Rotor IncludedNo
Front Rotor Diameter11.25 Inch
Front Caliper IncludedNo
Rear Caliper IncludedYes
Front Spindles IncludedNo
Master Cylinder IncludedNo
Brake Booster IncludedNo
Brake Hoses IncludedNo
Ford Bearing End StyleBig Ford (Old/New)
Rear Rotor IncludedYes
ColorNatural
Bolt Pattern5 on 4.5" | 4.75"
GENERAL
Sold in QuantityKit
Bore Size2.38"
Rotor Thickness1"
Rotor I.D.2.8"
Rotor Backspace2.3"
Stud Diameter0.5"
Axle Flange Offset2.36" - 2.50"
Mount TypeBolt-On
Brake Pad CompoundD154
Rotor FinishNatural
Rotor Material TypeCast Iron
Brake Lines IncludedNo
Parking Brake Cables IncludedNo
Bracket IncludedYes
Stud Diameter 20.4375"

Ratings & Reviews

4.4

10 Reviews

Overall Assessment

Customers appreciate the flexibility & fitting of our rear-end disk conversion kit. Quality parts are noted, reflecting high material standards. The kit's practicality is highlighted by easy installation, supplemented with online guides. Superior qualities like adapters and stainless bracket line kits are also preferred by customers. They recommend it for efficient, high-quality conversion needs over competitors.

4.4

10 reviews

5

7

4

2

3

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2

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1

1

Most Liked Positive Review

5.0

Good kit

Quality parts, fast shipping. Watched the youtube video for install. Bought a stainless braket line kit and adapters that worked great from Speedway too!

Most Liked Negative Review

1.0

Did Not Fit

Bought this kit that was made specifically for currie axles yet the inner rotor did not fit over my currie supplied axles. waste of money

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Did Not Fit

1.0

a month ago

Moneypit

San Jose

Verified

Bought this kit that was made specifically for currie axles yet the inner rotor did not fit over my currie supplied axles. waste of money

Would Not Recommend

Great product

5.0

5 months ago

Tom

Elgin,OK

Verified

Printed instructions were a little fuzzy, but they installed perfectly.

Would Recommend

Would buy again

5.0

a year ago

B.A.

Alabama

Verified

As described. All required parts provided.

Would Recommend

As described

5.0

a year ago

Terry

Alabama

Verified

Made for Curry axles

Would Recommend

Good Kit

4.0

a year ago

Terry H.

Alabama

Verified

Good kit. A little too much $$

Would Recommend

yes

5.0

a year ago

Jake

Indio, Ca.

Verified

fit & Finish

Would Recommend

Great upgrade setup!

5.0

a year ago

Sedgi

99320

Verified

Great disc upgrade setup package, including needed pr hard to find parts!

Would Recommend

Looks good

4.0

2 years ago

Jay

Ct

Verified

Good didnt install yet looks good

Rear end disk conversion kit

5.0

2 years ago

F1

NJ

Verified

I liked its flexibility. Overall good fit. Some adjustments needed.

Would Recommend

Good kit

5.0

4 years ago

Pete

Wichita, KS

Verified

Quality parts, fast shipping. Watched the youtube video for install. Bought a stainless braket line kit and adapters that worked great from Speedway too!

Showing 10 of 10 reviews

Questions & Answers

Fitment

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