The Nitro Helical Worm Gear is a torque-sensitive mechanical limited-slip differential that uses worm gears and spur gears to dispense and distinguish input power between two drive wheels or front and back axles. This is a completely separate design from the common beveled spider gear designs seen in most of the automotive industry.

Just like any LSD, the Nitro Helical Worm Gear functions as a standard or open differential under normal driving conditions, allowing one wheel to spin faster or slower as necessary. When a wheel experiences a loss of traction, the gear separation forces start to take effect and distributes the torque to the high-traction wheel by increasing the helical-shaped gears mesh force until wheel spin is reduced or entirely stopped. Once the vehicle exits the low traction condition, the differential resumes normal operation.

What's nice about the operation of a Nitro Helical Worm Gear LSD, is its characteristics; smooth, quiet and automatic. This LSD will engage without any driver awareness or require any action. It also has no wearable components and requires no maintenance, producing less time on the rack and more on the road.
Features:

• Helix Helical Gear Posi 35 Spline Front for Dana 60 4.56 and Up
• Differential: Dana 60
• Gear Ratio: 4.56 and Up
• Axle Splines: 35
• Ring Gear Bolts: 12 (not included)
• Warranty: 1 Year

Fits:

• 1978-1979 Ford F250 and F350 Snow Fighter
• 1985-1998 Ford F350 with Dana 60
• 1999-2001 Ford F350 with Dual Rear Wheels Dually
• 2002-Present Ford F250 F350 Superduty Pickup
• International 3/4 Ton Pickup Truck
• 1975-1993 Dodge W200 W250 3/4 Ton Pickup
• 1975-1993 Dodge W300 W350 1 Ton Pickup
• 1977-1987 Chevrolet GMC K30 1Ton Pickup Truck
• 1988-1991 GMC V3500 1Ton Pickup Truck
• 1988-1991 Chevrolet V30 and V3500 1Ton Pickup Truck
• 1969-1973 Jeep J2000 Pickup
• 1970-1972 Mopar B and E Body with Hemi or 440