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GM 12T 3.73 & Up, GM 12P 4.10 & Up, 30 Spline, Nitro Worm Gear Posi
GM 12T, GM 12P  Nitro Worm Gear Posi

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Nitro Worm Gear Posi
Price: $523.95

Product Code: TORS-GM12T-4

Description Vehicle Applications Warranty Information

GM 12 Bolt-Truck & GM 12 Bolt Passenger
30 Spline
Nitro Limited Slip Differential

1965-1981 Chevrolet & GMC C10 K10 Pickup Truck
1965-1981 Chevrolet & GMC Suburban 1/2 Ton
1969-1981 Chevrolet K5 Blazer
1970-1981 GMC K5 Jimmy
1971-1981 Chevrolet & GMC G10 G20 Van Vandura
1964-1972 Buick Wildcat
1964-1972 Chevy Bel Air
1964-1972 Chevy Biscayne
1967-1972 Chevy Camaro
1966-1970 Chevy Caprice
1964-1972 Chevy Chevelle/ Malibu
1964-1968 Chevy Chevy II
1965-1972 Chevy El Camino
1964-1972 Chevy Impala
1970-1972 Chevy Monte Carlo
1968-1972 Chevy Nomad
1964-1972 Chevy Nova
1970-1972 Pontiac GTO
1969-1972 Pontiac Trans Am

Differential: GM 12 Bolt Truck & Car
Gear Ratio: GM 12T 3.73 & Up
GM 12P 4.10 & Up
Axle Splines: 30
Ring Gear Bolts: 12 (not included)
Manufacturer: Nitro Gear & Axle
Warranty: 1 Year*

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.

Nitro Gear and Axle Premium Differential Ring and Pinion Gears, Axles and parts

Nitro Gear & Axle strives to provide the highest quality differential components available. We take the steps necessary to ensure our parts are dependable. Our product range is continually growing to meet the needs of consumers for new ratios and Fits. At Nitro we know differentials, and know what it takes to provide you with high quality components.


This product can expose you to chemicals including toluene and benzene, which are known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information go to: www.P65Warnings.ca.gov

  • Limited-slip operation
  • Helical-style pinion gears
  • Maintenance free
  • No additive required
  • No Clutches or cones to wear out
  • Smooth/Great traction improvement even over an OEM LSD
  • 1 Year Warranty*

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