The Strange 35 Spline S-Trac Differential is a helical differential that offers smooth and progressive power transfer. Its superior design and quality make it ideal for the most abusive Street/Track applications. The torque biasing S Trac Differential is purely mechanical which eliminates the need for clutches. It provides quiet operation while maximizing tire traction and vehicle acceleration.
The Strange Helical Differential
Built with forged steel case halves that are heat treated and fully machined to minimize weight and provide a rigid mounting surface for the ring gear resulting in improved gear life. Internal gear pocket geometry is designed to minimize stress risers increasing component life. The housing encapsulates precision manufactured gears, including 9310 steel pinion gears, that provide exceptional strength. All internal gears, pinion and side gears, are vacuum heat treated to increase strength and also cold treated to extend service life while reducing wear. A dry film solid lubricant coating is applied to friction surfaces to minimize wear.
Ideal for road racing, off-road and autocross applications.
The S Trac Helical Differential is recommended for full bodied street/track cars that run the 1/4 mile in the low 9 seconds or slower. For Drag Race Only vehicles, Strange Engineering recommends using a spool. The seamless operation also makes it ideal for road racing, off-road and autocross. This premium differential unit carries a limited lifetime replacement warranty to the original purchaser.
Part Number: N1980
Application – Ford 9″ with 35 spline axles
Requirements
Aftermarket 3.250″ bore case
Axles with 30 degree pressure angle
Description
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
Features
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
DO NOT USE SYNTHETIC GEAR OIL
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