Ford 9" 31 Spline Clutch Differential
Manufactured By Hoosier Gear


Part Number: N1970H

Ford 9″ with 31 spline axles

Hoosier 31 Spline Posi Unit
A perfect replacement for worn-out OEM clutch differentials
Forged steel halves eliminate breakage common to cast units

Forged Steel Case Halves
• Heat treated
• Fully machined
• Provides a light, durable, and rigid unit

Intended as a Factory Replacement
For high output vehicles, consider options below

Do Not Use Synthetic Gear Oil
Will adversely affect unit operation
Voids all manufacturer warranties

Use Petroleum Based 80W-90 or 85W-140
Requires 4 ounce bottle of limited-slip additive

Strange clutch style – N1970F
Eaton Truetrac – N1979
Eaton Detroit Locker – N1971

S-Series case – N2205
Pro Iron case – N1905
HD Pro Alum case kit – P3200

Side bearings & races – D1586 / D1588

Alloy axle package – P3102 / P3104


Ford 9″ 31 spline Hoosier Gear forged clutch style posi-unit

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