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Strange HD Pro 9" Ford Thru-Bolt Center Section
With 35 Spline S-Trac Differential & 1350 S-Series Yoke


Part Number: PRF180ST


• Professional assembly by Strange Engineering 
• Grade 8 ring gear bolts
• Shipped in protective container


HD Pro Thru-Bolt Case:
• Heat treated 206-T4 aluminum
• Billet aluminum main caps
• Solid Steel Adjuster Nuts
• Designed & machined by Strange
• Cast in the USA


Tapered Bearing Support:
• Billet aluminum
• Oversized bearings and races
• Pinion seal retainer ring



S-Trac Information 

3.250″ bore aftermarket case
Axles with 30 degree pressure angle



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 Unit
• Helical gear design
• 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

Attn: Do Not Use Synthetic Gear Oil or Posi Additive
Will adversely affect unit operation
Voids all manufacturer warranties




9" Ford Aluminum HD Pro Case, 35 Spl. S-Trac Street Gear, Strange Engineering

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