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Speedway Motors Bill Smith

Basic Brake Kit 1978-88 GM Caliper to Early Ford Spindles


Centerline of Holes:
Material Type:
Sold in Quantity:
Thread Pitch:
Bolt Hole Pattern:
4 on 4.63"
Hardware Included:
Garage Sale:
Includes brackets, hardware, seals, inner bearing cups and cones, and spacers.

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Watch the video below to learn how to correctly measure your wheel bolt pattern.




Q & A

What's in the Box

Easily installs 11" rotors and the 1978-up GM Metric calipers to your 1937-48 Ford passenger car spindles. No machine work needed. Please see below for suggested 1973-77 GM type 11" brake rotor part #'s required.

Kit Includes:
  • GM to Ford brake brackets
  • 1978-Up hardware
  • Bearing and seal adapters
  • Seals
  • Inner bearing cups
  • Inner bearing cones
  • Spacers
  • Instructions
  • Does not include dust caps, washers or spindle nuts

This kit works well with bolt-on steering arms. The 11" rotor brake kits are great for Street Rods based on 1932-48 Fords. However, for or a T bucket or early roadster, you might consider the Wilwood kits shown below.

702-4475 Instructions (PDF)

Item Details

1978-Up GM Caliper to Early Ford Spindles

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Disc Brake Kit, 1978-88 GM Caliper to Early Ford Spindle, 5 on 4-1/2 Inch

Easily installs 11" rotors and the 1978-up GM Metric calipers to your 1937-48 Ford passenger car and 1937-47 1/2 ton Ford spindles. No machine work needed. This kit works well with bolt-on steering arms. The 11" rotor brake kits are great for street rods based on 1932-48 Fords. Uses Ford/Mopar wheel bolt pattern of 5 on 4-1/2".

910-31945 Instructions (PDF)

Disc Brake Kit 1978-88 GM Caliper to Early Ford Spindle, 5 on 4-3/4 Inch

Easily install 11" rotors and 1978-88 GM Metric calipers to your 1937-48 Ford passenger car style spindles with no machine work needed. This disc brake kit is great for street rods based on 1932-1948 Fords. For lightweight cars like T-buckets or early roadsters, we recommend the Wilwood kits. This front disc brake conversion kit works well with bolt-on steering arms. The 11" diameter rotors have the GM wheel bolt pattern of 5 x 4-3/4". Calipers have 7/16"-20 inlets.

910-31946 Instructions (PDF)

1973-77 GM Midsize 11 Inch Disc Brake Rotor

This factory replacement 11" front disc brake rotor fits 1973-77 GM midsize chassis. Has a 5 on 4-3/4" bolt pattern.

11 Inch GM Brake Rotor with Ford Bolt Pattern

1973-1977 GM rotor redrilled to the 5 x 4-1/2" Ford bolt pattern. To be used with our #7024475 GM metric caliper adapter kit for disc brakes on a 1937-1948 Ford car spindle. Very common rotor to use as a conversion rotor. Has 1/2" fine wheel studs.

NOT interchangable with rotor 91031066. If you have brackets and adapters designed for the Granada rotor, use part #91031066.

Speedway Soft Street Brake Pads, GM Metric 1978-UP

Speedway soft brake pad for GM Metric 1978-Up.

Sold as one set of 4 (ST); outfits two calipers.

Tech Tip: You can fine tune your car's brake system by selecting different compounds for the front and rear, or side to side.

Tech Tip:  Only use full metallic pads on coated rotors.

Brake Pad Brand Guide (Link) 

Learn how to properly Bed-In your brake pads by reading our tech article.  Bedding-In Brake Pad Procedure.

Speedway 1928-1948 Ford Forged Spindles Only

These Speedway spindles are a one piece, drop forged design constructed of high strength 4140 steel, which makes them superior to original components. These spindles are modeled after the '37-'41 round-back design and use '37-'41 Ford kingpins. They  fit Ford axles from '28-'48 and can be used with period correct drum brakes or modern Speedway Motors disc brakes, but will not work with hubs from '28-'36.

  • Uses 1937-1941 kingpin kit
  • For Ford axles 1928-1948
  • Will not work with 1928-1936 Hubs

Be sure to include our kingpin kit (91032121) with these spindles.

Spindles also available in kit form with Standard or Deluxe kingpins.

Spindle Identification Guide (GIF)

910-32121 Instructions (PDF)

910-32122 Instructions (PDF)

1978-Up GM Metric Brake Calipers, IMCA Approved

These stock replacement single piston Metric calipers were standard equipment on 1978-88 GM mid-size cars (Cutlass, Grand Prix, Regals, Monte Carlo, etc.). They feature a 2.38" single piston, shielded bottom inlet, and will save 3-1/2 lbs. per side compared to mid-size 1969-1977 caliper.


  • IMCA approved
  • No core charge required
  • 7/16"-20 inlet
  • Can be used with brake hoses from Pre-1978 GM intermediate cars
  • Brake pads & bolts sold separately


Note: Does NOT include brake pads or slider bolts and bushings.

Bolt Kit for 1937-48 Ford Spindle Flat Steering Arms

For use with our '37-'48 Ford style spindles, steering arms, and brake brackets. 

Kit includes:

  • (4) 1/2"20 x 2" fine thread button head SCS SAE bolts
  • (4) 1/2" SAE Hex Lock Nuts
  • (4) 1/2" Thru hard washers
Replacement Tapered Outer Wheel Bearing Cone, Speedway/Metric Chassis

These steel outer bearing cones are replacement for our 1979-81 GM bearing and seal kit (910-31048). Fits tapered-bearing hubs. Works with stepped shaft spindles. If you have straight shaft, you will need two outer bearings.

  • Steel
  • Outer bearing cones
  • Replacement for 910-31048
  • Sold individually
Outer Wheel Bearing Cup, Tapered