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7.5" & 7.625" GM 28 Spline Nitro Helix, Helical Gear Posi
7.5" & 7.625" GM Rear 28 Spline (Large Journal) Nitro Helical Type Limited-Slip Differential

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Price: $523.95

Product Code: TORS-GM7.5-28

Description Vehicle Applications Warranty Information

GM 7.5" & 7.625"
Nitro Helix, Helical Gear Limited-Slip Differential

1982-2002 Chevy & GMC S10 Pickup
1982-2002 Chevy & GMC S10 Blazer Jimmy
1985-2003 Chevy Astro Van
1985-2003 GMC Safari Van
1992-1993 GMC Typhoon
1991 GMC Syclone
1982-2002 Chevy Camaro
1982-2002 Pontiac Firebird
1982-2002 Pontiac Trans Am
1978-1988 Chevy Monte Carlo
1978-1987 Chevy El Camino
1978-1987 GMC Caballero
1978-1988 Chevelle Malibu
1978-1993 Chevy Caprice Impala
1978-1987 Buick Regal
1978-1988 Pontiac Grand Prix

Differential: GM 7.5" & 7.625" Rear
Gear Ratio: 2.73 & up
Axle Splines: 28
Ring Gear Bolts: 10 (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 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 & Axle strives to provide the highest quality differential & axle 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.

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


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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Products > Carrier by Type > Limited Slip 'Posi' > Chevrolet & GMC > GM 7.5"/7.625"