GearFX - Ford 9 in. HS-Series Center Section

31 Spline TrueTrac - 3.89 Ratio

Part # 070750-389DS Be the first to write a review
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GearFX's Ford 9" HS-Series Rear Gear is built using the Ford Racing Investment Cast 3.250? bearing case. This case is ~4.5lbs lighter than the standard Ford 9" N-Series case. All GearFX rear gear builds use championship winning build procedures and attention to detail. All parts are individually inspected and hand deburred for quality assurance. Only the highest quality parts are used to produce a product that meets GearFX standards.


  • Ford SVO Nodular Iron "H" Case (3.250" Bearing) Made in USA with Ford Tooling
  • GFX 1350 Ultra Performance Yoke
  • U-joint Strap Kit with 12pt Bolts
  • Ford Pinion Seal
  • Ford Daytona Pinion Support
  • ARP Pinion Support Bolts
  • GFX Oil Slinger
  • TIMKEN Bearings
  • GFX Solid Pinion Preload Spacer
  • GFX Daytona Pinion Support "D" O-Ring
  • Eaton TrueTrac
  • Premium Ring and Pinion
  • ARP Ring Gear Bolts (Safety Wired)
Brand GearFXdriveline
Emission Code5
Gear Ratio3.89 Ratio
Product TypeRear Axles
California Proposition 65 RequiredYes
Part Number070750-389DS

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Add REM Isotropic Surface Finishing and Dyno Break-in below to increase performance, durability and trouble-free operation.

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    Some parts are not legal for use in California or other states with similar regulations.