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


S-Series Nodular Iron Case:
• Radial rib design increases stiffness
• 8-10% stronger material than factory nodular iron
• Additional mass in all critical areas
• Heavy duty nodular main caps
• Solid adjuster nuts
• Designed & machined by Strange
• Cast in the USA


Strange 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


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


*Do Not Use Synthetic Gear Oil


*Will adversely affect unit operation

*Use Petroleum Based 80W-90 or 85W-140

*Requires 4 ounce bottle of limited-slip additive



S-Series Nodular Iron Third Member with Differential, and 1350 Series Yoke.

Strange’s radial rib design significantly increases the rigidity of the case Strange Engineering’s own blend of nodular iron contains more bonding additive which increases material strength by 8-10%. Coupled with strategical reinforcements to the pinion support area, tail bearing pocket, and main caps, it exceeds the strength of the factory nodular case.

The 3.062” bore case will fit all differentials and spools from 28 to 33 spline. The pricing allows an individual to purchase a new upscale case at a price of a used and fatigued factory part.


The Strange S-Series Pinion Yoke is fully heat treated for maximum tensile strength. Made from top-tier nodular iron castings, this yoke is economical and strong. 

9" S-Series Nodular Iron Case, Tracloc Clutch Differential, Strange Engineering

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