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Founder, 1929-2014
Speedy Bill
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Magnum Axle 2870 1942-48 Ford 4 Inch Dropped I-Beam Axle

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Magnum Axle 2870 1942-48 Ford 4 Inch Dropped I-Beam Axle

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Q & A

What's in the Box

Fits 1942-1948 Ford passenger cars and works with a stock length spring. These 4" dropped axles accept 1937-48 Ford spindles and have 2-1/4" axle bosses. I-beam axles feature a one-piece design cast from high-strength 65-45-12 annealed ductile iron.

Axle measures 50" between kingpins and 40-5⁄8" wide between perch bolt center. Plain finish.

Caster Angle Illustration (GIF)

Leaf Spring Measuring Guide (Link)


Item Details

50-3/8" king pin centers
40-5/8" perch centers

You may also be interested in:

Posies Super Slide Springs 2037-40L 35-40 Ford Leaf Spring-2 In. Drop
(Part #58020374L)

Achieve a smoother, more comfortable ride with one of Posies Super Slide™ springs! The ends of the spring leaves of a Super Slide™ spring have a unique "dimple" shape that retains a moly-nylon button which works as a dry lubricant to stop leaf-to-leaf interference. This freedom from friction lets the spring move more easily, thereby giving a softer, quieter ride.

  • 35-3/4" Reverse Eye
  • Made in the U.S.A. from high grade tempered steel
  • Reversed eyes for a 2" drop compared to stock
  • Get your ride lower without sacrificing ride comfort
  • Plain steel finish

Posies Spring Application Chart (GIF)

Leaf Spring Measuring Guide (Link)  

1941-48 Ford Crossmember
(Part #91657104)
                        Lowers 1941-48's by 3 inches, with no other changes. Direct bolt-in. All mounting holes match original frame.

This is a spring mount crossmember for a 2" spring. It is 29-1/4" wide, end to end, or 27-5/8" wide, hole to hole.

Warning: This crossmember does not work with a Ford Flathead Motor - there is no place for original motor mounts.

Speedway 1928-1948 Ford Forged Spindles Only
(Part #91632104)

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)

Speedway 2 Inch Wide Nylon Spring Shackle Kit, Zinc
(Part #91033324-ZINC)

Fits front or rear springs. All measurements are width of spring. All nylon bushed shackles are 1-1/2" shackle bolt center to shackle bolt center.

Bushings are included. Bushing O.D. is 3/4".


Leaf Spring Measuring Guide (Link)