Currie complete Ford 9-inch third members make it easy to update your street rod, muscle car or race vehicle with a new gear ratio or carrier.

Every Currie Ford 9-inch third member includes: a new nodular iron or aluminum gear case, bearings, seals, solid pinion bearing spacer, pinion support, yoke, and choice of gear ratio, and limited-slip, locking differential or spool.

All Currie Ford 9-inch third members are assembled in-house by our team of experienced professionals and are shipped ready to be installed.

Common Features

• New Drop-In Third Member: All are brand new Currie assemblies designed as direct replacements/upgrades for Ford 9-inch rearends.

• In-House Assembly: Each unit is assembled and set up by skilled professionals before shipment, ensuring correct preload and adjustments.

• High-Quality Components: Heavy-duty pinion support and new bearing/seal packages standard.

• Performance Focused: Suitable for street performance, muscle car restoration, drag or cruise use.

Spline Selection

• 31-Spline — Mid-strength spline with wider aftermarket support and performance components; common upgrade for many street & light performance builds.

• 35-Spline — Heaviest duty spline option Currie offers; excels under higher torque/street/strip or heavy-duty use.

Gear Selection

Currie allows a wide range of gear ratios tailored to your vehicle’s performance goals. Options commonly include:

• 3.00:1 – Lower RPM street cruising.

• 3.25:1 – Balanced street/strip performance.

• 3.50:1 – Street performance, towing friendly.

• 3.70:1 – Performance acceleration focused.

• 3.89:1 – Sportier street feel.

• 4.11:1 – Aggressive acceleration / drag ready.

• 4.56:1 – Drag and race focused.

Carrier Selection

Currie offers multiple differential types so you get the traction behavior you want:

• Open Differential – Standard, no traction assist.

• Currie TwinTrac – Helical gear limited-slip (modern, smooth operation).

• Eaton Truetrac – Helical style limited-slip.

• Spool – for maximum traction, more common in performance/racing builds.

Additional combinations available. Visit the Product Line link below in the Specifications section to view all Currie Ford 9-inch third member options.