Home » Drag Racing Differentials & Spools » Ford 9 Inch Differential » Strange S-Trac Differential Fits 9″ Ford With 35 Spline Axles Requires Aftermarket 3.250″ Bore Case

Strange S-Trac Differential
Fits 9" Ford With 35 Spline Axles
Requires Aftermarket 3.250" Bore Case


Part Number: N1980


Ford 9″ with 35 spline axles


Aftermarket 3.250″ bore case
Axles with 30 degree pressure angle


Strange 35 Spline S-Trac
This helical gear differential offers smooth and progressive power transfer
Superior design and quality make it ideal for the most abusive Street/Track applications


Torque Biased, Mechanical & Clutchless
• Maximizes traction and acceleration
• Dependable and maintenance free
• Quiet operation

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

Internal Gear Pocket Geometry
• Minimizes stress risers
• Increases service life

Dry Film Solid Lubricant Coating
• Applied to thrust surfaces
• Minimizes component wear

9310 Steel Pinion Gears
• Chrome moly material
• Provides the ultimate in torque carrying capacity

Aggressive Gear Helix Angle
• Promotes superior torque bias
• Excels in situations of unequal traction

All Internal Gears Made from 9310 Steel
• Vacuum heat treated for superior strength
• Additionally cold treated to optimize fatigue life and reduce wear

Proven Quality
• Designed, machined, & assembled by Strange
• Materials made in the USA

Gear Lube

Will adversely affect unit operation and void warranty

Use Only Petroleum Based 85W-140 Gear Oil

Related Components

S-Series 3.250″ bore case…………. N2206
Pro Iron 3.250″ bore case…………. N1906
Pro HD Alum 3.250″ case kit……… P3203

Side bearings & races……………….. D1590

Alloy axle package………………. P3502 / P3504


Parts List and Installation Guide pdf File


Strange Helical Differential Ford 9in – 35 Spline (Afternarket 3.250″ Bore Case Required)

Additional information

Weight 16.75 lbs