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$349.99
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit

Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit

Ford 9", Rear Position, Dual: 5 on 4.5" | 4.75" Bolt Pattern, 11.25 Inch Rotor Diameter

22 Reviews | 37 Answered Questions
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Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
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Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
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Part # 91031902
$349.99
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Details

Position:
Rear
Bolt Pattern:
Dual: 5 on 4.5" | 4.75"
Rotor Diameter:
11.25 Inch
Rotor Type:
Vented
Caliper Pistons:
Single
Caliper Finish:
Natural
MFG. Part #:
91031902
Rotor Thickness:
1.00"
Rotor Shape:
Round
Hardware Included:
Yes
Sold in Quantity:
Kit
Notes:
Works with 8" Ford and new and old style big bearing Ford 9" using 3/8" retaining bolts.

Info

If you dont want to spend an arm and a leg on a rear disc brake kit and still have to weld the bracket on, we've got you covered. This kit includes bolt-on caliper brackets, 11-1/4" vented rotors, 78-88 GM metric style calipers, brake pads and hardware.

  • Fits both 5 on 4-1/2" and 5 on 4-3/4" bolt circles
  • For Ford passenger car axles ONLY¬†
  • Fits axle with maximum flange diameter of 6-1/4" O.D.
  • For 15" and larger wheel applications ONLY

NOTE: This bolt on brake kit is designed to be used on 8" and 9" housings using 3/8" retaining bolts. If you want to use it on a 9" housing with 1/2" bolts, you will need to use the 3/8" hardware to do so. 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".

Axle Flange Identification Chart (GIF)

910-31902 Instructions (PDF)

Item Details

With non-emergency brake calipers.

Application

  • "Old-style" big bearing 9" Ford axle
  • "New-style" big bearing 9" Ford axle
  • 8" Ford axle
  • Axle housings with minimum axle offsets of 2-3/8" to 2-1/2"

This kit will NOT work on pickup housings or the 50's 9" housings as they only have about 2" backspace. The exception would be the late 50's station wagon rear ends.

When using with a Currie Axle with an o/d register of  2.795", the rotor is included in this kit with an i/d register of 2.78" and therefore will need to be machined by increasing the hole diameter in the rotor to match the Currie axle spec of 2.795"

Notes

Installation note:

The inside diameter of this rotor will accept an axle flange that has a diameter of 6-1/4" or smaller.  If your axle flange exceeds 6-1/4" in diameter, you will need machine your axle flange to decrease your axle flange diameter to fit this rotor as necessary.

When utilizing an aftermarket axle with disc brake conversion kits, it may be necessary to reduce the diameter of the axle flange to a diameter necessary to adequately fit inside the required Clearance I.D. that the brake hat/brake rotor will require.  (see above diagram for illustration)

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

Related Products

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.
  • Speedway Replacement 11-1/4 Inch Rear Brake Rotor
    Qty x 2
  • Speedway Soft Street Brake Pads, GM Metric 1978-Up D154
    Qty x 1
  • GM Metric Disc Brake to 9 Inch Ford Bracket Set
    Qty x 1
  • Ford 9 Inch Brake Bolt Kit
    Qty x 1
  • IMCA Approved 1978-88 GM Metric LH Brake Caliper, 7/16-20 Inlet
    Qty x 1
  • IMCA Approved 1978-88 GM Metric RH Brake Caliper, 7/16-20 Inlet
    Qty x 1
  • Speedway GM Brake Caliper Slider Slide Bolt
    Qty x 4
  • Instruction Sheet 91031902/91031921
    Qty x 1

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