Strange HD Pro 9" Ford Thru-Bolt Center Section
With 35 Spline S-Trac Differential & 1350 S-Series Yoke
 
Part Number: PRF180ST
 
Includes:
• 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 
Requires:
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