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Product Summary

Ford 9 Inch, Grand National, Cast Iron, Natural

  • It increases durability and strengthens a known weak point in Ford 9-inch axle assemblies
  • The use of larger bearing adds strength, reduces gear deflection in high horsepower/torque applications
  • Features bigger oiling channels extend bearing life
  • Has a milled gasket surfaces for a leak-free seal
  • Will work on all standard 28-spline 1.218” Ford 9-inch pinion gears

Key Specs

MFG. Part #91048399
BrandSpeedway Motors
Material TypeCast Iron
FinishNatural

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Details

“Daytona” pinion bearing supports use larger bearings and strengthen a known weak point on Ford 9-inch axle assemblies. Designed by Ford in the 1960’s to take the punishment of NASCAR racing, the larger bearings of the Daytona pinion support significantly reduce pinion gear deflection to improve durability. Gear deflection occurs when the pinion shaft moves out of alignment under heavy loads, causing the tooth contact pattern to change. Reduced tooth contact (under heavy load) with the ring gear typically leads to catastrophic axle failure. 

Daytona pinion bearings are set up differently than traditional Ford 9-Inch pinions you’ll find under most cars, trucks, and vans (but they’ll easily adapt to all of them). By using bearing spacers with shims rather than a traditional crush sleeve, the solid spacer and shim pack won’t deform under load. This maintains critical depth settings which helps preserve that important tooth contact pattern.  Plus, this set-up makes gear ratio swaps, yoke upgrades and third-member rebuilds much easier. Just re-insert the shims and torque the pinion nut to set pinion depth! Fits all 1.218” 28-spline Ford 9-inch pinion gears.

The benefits of Daytona bearing retainers don’t end there. Our Daytona pinion support features a beefed-up nodular iron housing. Nodular iron, also known as ductile iron, has greater tensile strength and is less prone to fracturing than ordinary “gray” cast iron. Plus, larger oiling channels ensure more gear oil flows across the bearing, extending bearing life. Milled gasket surfaces ensure a leak-free seal.

Whether you’re upgrading an OEM Ford 9-inch or building a stout rear end from the ground up, don’t take shortcuts! Improve reliability and longevity with a nodular iron Daytona pinion bearing support.

  • Increases durability and strengthens a known weak point in Ford 9-inch axle assemblies
  • Larger bearing adds strength, reduces gear deflection in high horsepower/torque applications
  • Uses bearing spacer/shim combo in place of the crush sleeve
  • Makes third member rebuilds, gear changes and yoke changes much easier
  • Nodular (ductile) iron housing is stronger than “gray” iron and less prone to fractures
  • 5.85 lb. casting is heavier and better reinforced than OEM Ford retainers
  • Bigger oiling channels extend bearing life
  • Milled gasket surfaces for a leak-free seal
  • Works on all standard 28-spline 1.218” Ford 9-inch pinion gears
  • Easy upgrade for all OEM Ford 9-Inch third member carriers
  • Bearings, races, spacers, and shims sold separately

Specifications

KEY SPECS
MFG. Part #91048399
BrandSpeedway Motors
Material TypeCast Iron
FinishNatural
GENERAL
Sold in QuantityEach