12 Bolt Truck Spec Truetrac
 
RING GEAR RATIO
3.73 & up
DIFFERENTIAL TYPE
Limited Slip (LSD)
AXLE DESCRIPTION
GM 12 bolt C-Clip
VEHICLE TYPE (MODEL)
Half-Ton Truck
VEHICLE USAGE
Off-Road: Light Trail / Sand Sports
On Road: Restoration
On Road: Street and Muscle
On Road: Work Truck / Towing
On Road: Circle Track
On Road: Drag Racing
Off-Road: Extreme Off-Road
Off-Road: Rock Crawl
Off-Road: Work Truck / Towing
GEAR SPLINE TOOTH COUNT
30 EA
MODEL YEAR END
1982
AXLE SHAFT DIAMETER
1.3 in
RING GEAR SIZE
8.875 in
AXLE LOCATION
Rear
GEAR RATIO
3.73 & up
VEHICLE MAKE
General Motors
MODEL YEAR START
1964
 
All Eaton differentials made for General Motors 8.5" and 8.6" axles require special bearings. For axles with small bearing bores (race O.D. or 2.89"), usually found on vehicles prior to 1999, bearing LM102949 and race LM102911 are required. For axles with large bearing bores (race O.D. of 3.06"), usually found on vehicles from 1999 to present, bearing LM603049 and race LM603012 are required.