Ford Model A Rear Axle Specifications

Type: Three Quarter Floating

Material: Special Ford Carbon Manganese Steel

Gear Ratios:

  • 3.78:1
  • 3.70:1 (early 28’s)
  • 3.54:1
  • 4.11:1

Bearings:

  • Rear Wheel:
    • O.D. of Axle Housing Race – 2.061″ to 2.0635″
    • I.D. of Wheel Hub 3.188″ to 3.190″ – Max Wear 3.185″
  • Pinion Bearing:
    • Timken 28156 (2 each) – Double Taper Roller Type
    • Bearing Cup: Timken 28317

Ring Gear:

  • 8.4″ Pitch Diameter
  • 1 3/16″ Wide Teeth

Axle Shaft:

  • 1 1/8″ Diameter
  • 1.128″-1.130″ at Wheel Bearing

Dimension From Housing Flange to bearing Shoulder in Axle Housing:

  • Before 1929: 1.370″ to 1.372″
  • After: 1.365″ to 1.367″

Axle and Drive Shaft Seal: CR 10926

Rear Axle Seal: CR 20112, Victor 49024

Differential Lube: 600W to 160W

Differential Oil Capacity: 2 1/4 Pint

Torque Specs:

  • Axle Nut Torque: 100 ft/lbs

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