Easily installs 11" rotors and '69-'77 mid-size GM single piston calipers to your '37-'48 Ford passenger car spindles or '37-'47 Ford pickup spindles, No machine work needed on square back spindles (minor grinding on round back spindles), press on inner wheel bearing adapters included, Bracket kit includes LH & RH caliper brackets, inner wheel bearings, bearing adapters, races, and hub seals along with caliper bracket hardware, Same bracket kit as used in complete disc brake conversion kits 910-31942 and 910-31942D, Works with bolt-on steering arms or stock arms
Disc Brake Bracket Kit for 1937-48 Ford Spindles, Big GM Caliper Speedway Motors
Disc Brake Bracket Kit for 1937-48 Ford Spindles, Big GM Caliper
Sku # 91631903
Mfr. Part # 91631903
Condition
New
Brand
Speedway Motors
Sold
Box
Details
Info
  • Works on all 1937-1948 car and 1937-1947 truck spindles
  • Brackets fit 1942-1948 square back style spindles with zero modifications
  • Also fits 1937-1941 round back style spindle with minor grinding of the spindle
  • This kit works with both cast in and bolt-on steering arms without issue
  • Will work with Speedway Motors spindles if clearance is provided
  • Disc brake style wheels are required for proper caliper clearance when upgrading from drum brakes
  • Bracket kit designed to use customer supplied GM-style 1969-1977 "Midsize"calipers
  • Includes brackets, inner bearing races and bearings, spindle adapters, and mounting hardware
  • Customer must also supply 1969-1972 GM 11-inch vented rotors
  • Kit requires outer wheel bearings, spindle nut kit, and dust caps to complete installation
  • Brake hydraulic hoses and fittings not included

Add Disc Brakes to Your Straight Axle Hot Rod with Bolt-On Ease

We understand that the traditional straight axle hot rodder is going to want to keep the look of early Ford brakes and their finned drums on their Model A or 32 roadster if at all possible. However, we know there is a large base of builders that want their classic looks but with modern handling, braking, and comfort. Face it, if your hot rod is a miserable ride that will not stop you are not going to want to drive it. We get it. For those enthusiasts, a small amount of leeway in their hot rod's traditional looks is acceptable to make it a fun long-distance cruiser that can be safely operated in today's traffic. One of the top safety upgrades we see is updating these straight axle hot rods with front disc brake kits. Speedway Motors offers several disc brake conversion kit options to get the job done on your spindles, and if you do not have spindles for your hot rod straight axle setup, well, we have those as well!

Just The Basics to Make Your Brake Conversion Happen

Most of our straight axle disc brake kits ship complete with everything you need, but we know a lot of our customers have spare parts from previous builds or wish to make their disc brake upgrade stand out with custom calipers and rotors from alternative sources. Many have asked us to create a basic conversion kit with just the caliper adapter bracket and conversion hardware required. We have listened and this caliper bracket kit for on 1937-1948 Ford spindles is just the ticket. Why buy a complete kit when you are planning to upgrade to an aluminum caliper and a braided Teflon -3 AN brake hose for example? You are buying parts you will never use just to sit on a shelf in your garage forever. With our bracket kit you get just the specialized conversion parts you need and nothing more, leaving the rotor, caliper, brake hose, and so on up to you, saving you money.

The caliper mounting brackets provided fit '37-'48 Ford spindles and are quite stout to prevent any caliper flex during hard braking. They are direct fit to the 1942-1948 "square back"Ford spindles. If you have the earlier 1937-1941 Ford "round back"spindles this kit will still fit with some minor clearance work to the spindle to allow the caliper mounting bracket to properly seat to the spindle. And if you do not have any spindles at all for your project that is not a problem either, as we offer a beautiful set of forgedthat include new king pins with installed bushings to help you finish your project. Do not forget yourtoo, especially if you are using a drop axle, as aftermarket steering arms will save a lot of time and frustration in this regard. Also included in the kit is our machined spindle adapter, and conversion inner wheel bearing and race with spacers, plus mounting hardware for the caliper mounting bracket.

This bracket kit will add 8-1/4 inches overall to your straight axle's center-to-center distance of your king pins when used with the specified rotors and calipers. Meaning, if you are running a 48-inch axle, your overall width once installed will be 56-1/4 inches. This may be more or less than your current setup depending upon current brake package and wheel spacers. This kit requires a minimum of a 14-inch "disc brake" wheel, however we recommend a 15-inch wheel with a 2.80-inch hubI.D.that is lug-centric for proper clearance.

An Easy DIY Installation You Can Complete in Your Home Garage

To complete your installation, you will need the previously mentioned 1969-1977 GM "Midsize"calipers along with 1969-1972 GM 11-inch disc brake rotors. Standard use the GM 5x4-3/4 wheel stud pattern with GM spec 7/16-20 thread studs. In addition, you will need a pair of, a,and a pair of.

The included inner bearing adapter that fits over the spindle requires a small press for installation (or you can heat it up to allow expansion and slip it on that way) and you will need to replace the inner bearing race in the included disc brake rotor with the new race provided. While there are several methods to install the supplied bearing race, the easiest way is with a. It is a very handy tool for removing and installing bearing races and bearing seals. Everything else in the kit will install with traditional hand tools any hot rodder will surely have in their toolbox.

The final piece of the installation puzzle will be your caliper's brake hoses. This kit does not include hoses because we offer so many options in SAE 7/16-20 fluid port threads. You will need to determine your overall hose length needed before you can order the correct brake hose for your installation. We offer plenty ofavailable to suit your specific build style and clearance requirements. Speedway Motors also offersthat may aid in routing your caliper fluid lines while providing a cleaner look that keeps your brake hoses away from your straight axle's front suspension.

Adding disc brakes to your pre-war straight axle hot rod has never been easier thanks to Speedway Motors and the value you get for your money means more budget left over for those T-bucket parts you need! Ordering our brake bracket kit provides just the essentials for your straight axle disc brake conversion and allows you to customize your front disc brake upgrade as you wish without wasting money or parts.

Charts

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Specs
Material Type
Steel
Sold in Quantity
Kit
Notes
Includes brackets, hardware, seals, inner bearing cups and cones, and spacers.
Hardware Included
Yes
Centerline of Holes
7.00
Material Thickness
.31
Finish
Zinc Plated
MFG. Part #
91631903
Reviews

Nicely made

Rated
Product Rating
by Eddies on December 23, 2021

Summary: Everything I need. Already had the calipers and rotors. Able to get only what I needed.

Yes, I recommend this product.

yes I woule buy this item again

Rated
Product Rating
by Joe on October 25, 2017

Summary: fit my needs perfectly

Yes, I recommend this product.

Easy to install I would order again

Rated
Product Rating
by Homeshopper on July 15, 2017

Summary: Used on 40 truck ratrod looks good

Yes, I recommend this product.

Loved the ease of this kit

Rated
Product Rating
by Calvin on July 14, 2017

Summary: Easy kit to use but I don't understand why no outer bearings

Yes, I recommend this product.

I would buy this again

Rated
Product Rating
by Tom on May 12, 2017

Summary: I bought this kit. Very easy to install. Thanks you tech department for helping with installing. This kit looks so awsome

Pros: Easy To Set Up Easy To Store Increases Efficiency Low Power Requirements Rugged Construction Versatile

Related Items / Suggested Parts
Tech Support
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About
Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 72 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.