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GM 8.5" 10 bolt AAM 860 28 Spline, ARB Air Locker
ARB GM 8.5"  28 Spline Air Locker

Price: $1,253.76

Product Code: ARBRD221

Description Vehicle Applications Warranty Information

GM 8.5" & 8.6" 10 bolt 28 Spline
ARB Air Locker RD221

1970-1981 Chevrolet Camaro
1970-1981 Pontiac Firebird
1970-1981 Pontiac Trans-am
1971-1996 Chevrolet Caprice
1971-1985 Chevrolet Impala
1970-1979 Chevrolet Nova
1970-1977 Chevrolet Monte Carlo
1973-1977 Chevrolet El Camino
1973-1977 Chevrolet Chevelle
1973-1977 Buick Regal
1975-1979 Buick Skylark
1973-1975 Buick Apollo
1975-1979 Oldsmobile Omega
1971-1977 Pontiac Ventura
1982-1987 Buick Grand National
1982-1987 Buick Regal T-Type
1987 Buick GNX
1984 Oldsmobile Hurst Olds
1981-1987 Chevrolet G10
1981-1987 Chevrolet G20
1981-1987 GMC G10
1981-1987 GMC G20
1981-1987 Chevrolet K5 Blazer
1981-1987 GMC K5 Jimmy
1981-1987 Chevy Suburban 1/2 ton
1981-1987 GMC Suburban 1/2 ton
1981-1987 Chevrolet C10
1981-1987 Chevrolet K10
1981-1987 GMC C10
1981-1987 GMC K10
1981-1987 Chevrolet C1500
1981-1987 Chevrolet K1500
1981-1987 GMC C1500
1981-1987 GMC K1500

Differential: GM 10 bolt
Gear Ratio: 2.73 & Up
Axle Splines: 28
Ring Gear Bolts: 10 (not included)
Manufacturer: ARB
Warranty: 5 Years

Tech Note:
With increased demand from the market, ARB's air locker engineers have developed some new applications, specifically designed around the demands of those who are looking for additional strength above what a standard 30 spline 14 bolt axle shafts offer. We are proud to offer both a 40 spline options as an answer to the growing demand and usage of the 14 bolt axle.

Required Parts:
These parts are required for installing this product on your vehicle.
CKSA12 air compressor (extremely compact, operates up to 2 air lockers, not intended for oversized tire inflation) or
CKMA12 air compressor (compact, operates up to 2 air lockers and will inflate tires when paired with a 171302) or
CKMTA12 air compressor (still compact, operates up to 2 air lockers when paired with 171503, will inflate tires AND run air tools when paired with a 171302 and will run even faster when paired with a171501 air tank

Optional Parts:
These parts are not required for installing this product on your vehicle.
ALSB3 - bracket for mounting three (3) rocker switches. Manufactured from steel and powder-coated black. (Suitable for moutning both a front and rear air locker and a compressor switch.)

"With our improved two piece design available right across the range, along with the addition of forged gears and an industry leading five year warranty, ARB Air Lockers are now better built and better backed than ever before.

Created to provide 100% traction on demand, without sacrificing any of your vehicle's highway driving performance, ARB Air Lockers employ a 12 volt ARB Air Compressor designed to activate (and deactivate) a solid and durable locking mechanism inside the differential. This gives you the traction you need, when you need it, all at the flip of a switch and all within the comfort of the driver's seat.

The advantage of the ARB Air Locker lies in the pneumatically operated locking system inside the differential. When activated, the Air Locker prevents the differential gears from rotating and therefore prevents the axle shafts from turning independently of each other. With both wheels tied directly to the rotation of the ring gear, the vehicle maintains maximum possible traction at all times. When unlocked, it operates just like a conventional 'open' differential.

In addition to providing outright improvements to a 4x4's off road capabilities, the Air Locker offers significant environmental benefits. An Air Locker equipped vehicle can be driven in a slower, safer and more controlled manner, greatly reducing the likelihood of vehicle damage and environmental impact."


  • 5 Year Warranty*
  • Provides 100% traction on demand without affecting on-road drivability or driveline wear
  • Vastly improved traction means less reliance on momentum, thus reducing the likelihood of vehicle damage and environmental impact
  • Easy, convenient operation allows the user to concentrate on the terrain without leaving the comfort and safety of the driver’s seat
  • Ultra durable and extremely strong – only the highest quality materials used in construction
  • Incredibly simple yet effective design that employs minimal moving parts, thereby ensuring maximum reliability
  • Thoroughly tested and proven design – trusted and used in over 100 countries around the world
  • Front and rear Air Lockers available for most makes and models 4WD and 2WD applications
  • Easy installation and maintenance – no special tools, skills or additives required
  • Patented‘timed’ locking mechanism offers high strength and ultrafast un-locking (#1, #14 & #16).
  • Comprehensive photo illustrated installation and service guides.
  • Steel reinforced, elastomer bonded annular seal designed to handle the most extreme climatic temperatures on Earth
  • Patented 2 piece design that offers a range of interchangeable side gears (sold separately) to integrate with non-standard axle shaft splines

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