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Full Floating 9" Rear End System

**Now available with Kelsey Hayes 4 piston iron calipers**
Vintage legal for 69-70 Trans-AM cars

When building a maximum performance street or track car you find all sorts of weaknesses in the stock components.  One major component that desperately needs attention is the stock rear end.  Its semi-floating design allows the axles to move back and forth slightly on square roller bearings.  If you want to run serious rear brakes in the form of a fixed caliper, you'll find this movement pushes the pads away from the rotor when cornering, only to really get your attention when you need to brake for the next corner.  You end up pumping the pedal or have a very long pedal as you have to move the pads back to the rotor face before any friction can occur and slow the car.  Not an enjoyable feeling.  I much prefer a pedal that is in the same position every time and having amazing stopping ability each and every time I step on the brake pedal.  Brakes are not optional!

One other major safety concern with the stock rear end housing and axle design is that if you break an axle in the right spot, you can loose a wheel!  Think about it.  All that holds your wheel on is the flimsy stock bearing retaining plate and the bearing being pressed onto the axle.  If the axle breaks on the outboard side of the bearing or the bearing fails the wheel is able to fly off in a direction you don't really want it to go!  With today's sticky tires and modern suspension designs exerting way more loads onto components that were originally designed for skinny bias ply tires, we should all take a long hard look at these critical safety areas of our cars.

Our Full Floating 9" Rear End System eliminates pad knock back and removes the safety concern of breaking an axle.  The weight of the car now rides on the housing, not the axle like the stock design. 

Our CNC machined snout accepts massive tapered roller bearings.  Just like a front hub on a spindle, once installed this eliminates side to side movement.

Here you can see the heat treated forged hub installed and secured with the spindle nut.

Over the studs and hub slips our heat treated drive plate.  The outer splines of our straight axle meshes with this to provide drive.

A dust cap covers the outer splined end of the axle.  Just add wheels.

Housing features a fill, level and drain plug.

7/16" stud is welded to the top of the drivers side axle tube 17" in from the wheel mounting surface. Picture shows our intermediate brake hose ready to be secured with a nut (hose not included).

Baffled -6AN vent fitting allows for easy and convenient vent hose connection.

Leaf spring saddles are installed at 43" apart with a pad to pinion angle of 3 degrees up.


Watch as we install the hub and rotor assembly onto our Full Floating System. You'll be able to see how simple the system is to install and maintain as well as get a peek at just how cool it is!
New Street Version with Internal Parking Brake!


Our Full Floating 9" Rear End System includes:
  • Brand new, heavy duty 9" housing with full 3" O.D. axle tubes.  Brake brackets and leaf spring saddles come installed and are beautifully and professionally Tig welded then the housing is straightened to ensure trueness.  Housing is powder coated gloss black and looks almost too nice to install out of sight under your car!
  • Housing includes a baffled -6AN vent tube on the LH side, fill, level and drain plugs and a 7/6" stud on the LH axle tube for brake flex line mounting.
  • Solid premium alloy steel, double heat treated, 31 spline, fully polished axles.  Axle installation and removal tool included.
  • Axle tube seals.  These install in the housing to keep gear lube from migrating down the tubes and keep it in the center section of the housing.
  • Forged 4140, heat treated steel hubs with races pre-installed.
  • 3" long 1/2-20 ARP bullet nose wheel studs pre-installed into hubs.
  • Massive tapered roller bearings, keyed washer, nut and lock ring.  Special spindle nut socket included.
  • 11.75" x .810" heavy duty rotors mounted to steel rotor adapters.  Packages under most 15" wheels without wheel spacers.
  • 4 piston stress flow forged aluminum calipers & pads.  Each caliper is equipped with stainless steel bridge plates. The plates eliminate the bridge wear caused by pad gouging and extend the service life of the caliper body. The spring-loading action of the plates also eliminates pad rattle and dampens the vibration harmonics that contribute to squeal under braking. Other features include high temperature seals and stainless steel pistons to eliminate corrosion and retard heat transfer from the pads. Internal fluid passages eliminate the need for external tubes. Four corner bleed screws assure simple and effective air evacuation.  Calipers come standard powder coated either bright red or gloss black.

Specialized spindle nut socket included.

Axle installation/removal tool included.

Inner axle tube seals included.

Critical dimensions you should know about our housing:

  • For 65-66 Mustangs our system is built 57.25" wide measured from wheel mounting surface to wheel mounting surface.  For 67-70 Mustangs we build them 59.25" wide.  This measurement is taken from the drum or disk face your wheel mounts to.  If you need it wider or narrower please contact us.
  • Leaf spring pads are installed 43" on center which is the stock location for 65-70 Mustangs.  If you need them in a different location, please contact us.
  • Leaf spring pad to pinion angle is 3 degrees up.  If you need a different angle please let us know.
  • Pinion is located 3/16" to passenger side.  If you need it offset one side or the other please let us know.
  • A 7/16" x 1-1/4" long stud is welded onto the top of the drivers side axle tube 17" in from the wheel mounting face to enable easy mounting of brake line blocks (please see picture above).
  • A -6AN vent tube is welded on the drivers side of the housing (please see picture above).
  • Standard hubs use the Ford 5x4.5" bolt pattern.  Other bolt patterns are available.
  • Please note that if you decide to change any of our standard dimensions the housing is considered custom and is non-returnable.  Please measure twice and order once. 

System is shipped ready to install.  Simply pack the wheel bearings, install the hubs, run brake lines, add your center section, install the axles, fill with fluid and its ready to run!  Our housing is highly customizable and can be made wider/narrower, shipped with or without leaf spring saddles, painted or bare.  If you have a custom application let us know and we will try our best to accommodate you!  All systems are built to your specifications, please allow 6-8 weeks build time.

SOT Full Floater Ford 9 Inch Rear End Assembly

Part # Description Price Qty Purchase

1964-1970 Mustang RACE Full Floating 9" Rear End System with 11.75"x810 Rotors and 4S Piston Aluminum Calipers - No parking brake
Click here to select a 9" Third Member Sold Separately


1964-1970 Mustang RACE Full Floating 9" Rear End System with 11.75"x810 Rotors and Kelsey Hayes 4 Piston Calipers - No parking brake
Click here to select a 9" Third Member Sold Separately


1964-1970 Mustang STREET Full Floating 9" Rear End System with 13"x810 Rotors and 4S Piston Aluminum Calipers and Internal Parking Brake
For 1965-66 Mustangs, this kit is not a bolt in set-up. It would require a mini tub kit, and a 3 link system to complete the task.
Click here to select a 9" Third Member Sold Separately Requires 17" or larger wheels...


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