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  Store > Eaton TrueTrac >

GM 8.5" Eaton TrueTrac | 28 Spline C-Clip (2.73 & Up)
Eaton TrueTrac
 
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Price: $649.99


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Status: Normally Ships in 2-5 Business Days

Part Number: EAT-912A556

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Description
 

Eaton Model: Application: Axle Shafts: Gear Ratios:
912A556 GM 8.5" C-Clip 28 Spline 2.73 +

This Eaton TrueTrac fits 1971 to 1989 GM 8.5" axles with 28 spline c-clip shafts.

Axles with 2.89" bearing bore ('98 & older) require LM102949 / LM102911 bearings.
Axles with 3.06" bearing bore ('99-'03) require LM603049 / LM603012 bearings.

This differential fits 2.73 and numerically higher gears. Do not use "thick" gears.
For more information, please see Thick Gears and Carrier Breaks.


Chevy G20 1975 - 1989 Rear
Chevy C10/K10 1979 - 1986 Rear
Chevy G10 1979 - 1989 Rear
Chevy C1500 1988 - 1989 Rear
Chevy K5 Blazer 1979 - 1986 Rear
Chevy Blazer 1987 - 1989 Rear
Chevy Nova 1970 - 1979 Rear
Chevy Camaro 1970 - 1981 Rear
Chevy Malibu 1973 - 1983 Rear
Chevy Caprice 1970 - 1989 Rear
Chevy Monte Carlo 1973 - 1978 Rear
Chevy S10 1982 - 1982 Rear
Chevy Bel Air 1970 - 1975 Rear
Chevy El Camino 1971 - 1979 Rear
Chevy Impala 1971 - 1985 Rear
GMC K1500 / G1500 1979 - 1988 Rear
GMC C1500 1979 - 1989 Rear
GMC G2500 1979 - 1988 Rear
GMC C1500 / K1500 Suburban 1979 - 1986 Rear
Buick Electra 1971 - 1989 Rear
Buick Regal 1973 - 1987 Rear
Buick Apollo 1973 - 1975 Rear
Buick Skylark 1970 - 1979 Rear
Buick Riviera 1975 - 1978 Rear
Oldsmobile Omega 1973 - 1979 Rear
Oldsmobile Cutlass 1970 - 1977 Rear
Pontiac Bonneville 1970 - 1986 Rear
Pontiac Ventura 1976 - 1977 Rear
Pontiac Firebird 1970 - 1981 Rear
Pontiac GTO 1970 - 1973 Rear
Pontiac Catalina 1970 - 1981 Rear
Pontiac LeMans 1971 - 1981 Rear
Pontiac Grand Prix 1971 - 1987 Rear
Plymouth Volare 1978 - 1979 Rear

Application chart is for reference only, vehicle configurations may vary.
Customer is responsible for confirming fitment before ordering.
Contact us directly with any questions.


How Does The TrueTrac Compare To Other Differentials?

[ Jump To TrueTrac Section of Video | Crawlpedia Differential Locker Comparison ]



(TrueTrac information starts at 6:05 or click here.)


TrueTrac differentials are Torsen style limited slip differentials that use helical gears instead of clutch packs to offer automatic torque biased traction to both drive wheels at all times. The ingenious design limits the speed of each wheel to about 1.5 times faster or slower than the opposite wheel to provide full-time traction while still allowing for wheel speed differentiation in turns. The heavy duty all-gear design not only makes for quite and smooth operation, it requires no maintenance and will never weaken or wear out like a typical limited slip differential. These unique features make the Eaton TrueTrac ideal for race cars, rally cars, trail rigs, full size trucks, and daily drivers. The design works so well, in fact, that the US military chose the Torsen differential as standard equipment on Humvee's (and the civilian Hummer H1).


Eaton specifically designed and built the TrueTrac for use in 4x4 vehicles and to withstand the abuses of off-roading. Precision forged gears, high strength materials, and high-tech manufacturing procedures make the TrueTrac one of the most durable and reliable limited slip lockers on the market today. They are easy to install and maintenance free.
Features
  • Torque biasing helical gear design
  • Smooth, quiet, and automatic operation
  • Works in front or real axle applications
  • Maintenance free limited-slip locker
  • Heavy duty construction
  • ABS compatible


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