1963-1982 GM 8.875" 12 Bolt Truck - Gear and Limited Slip Posi Package w/ Install Kit
POSI-GM12T-3-RA GM12T-308-RA GM12MK-T
Positraction, Gear & Install Package
Rigid Axle
GM 8.875" 12 Bolt Truck Posi Package
Description
Package Includes:
(1) Limited Slip Positraction Carrier
(1) Ring and Pinion Gear Set (Choose Ratio Above)
(1) Differential Master Install Kit
- Our Rigid Axle Eaton style limited-slip positraction unit uses Raybestos composite clutches for smooth and aggressive traction. The carrier case is forged steel for strength and reliability. Because this carrier is an eaton style clutch posi, it can be rebuilt and serviced. Our Rigid Axle positraction is the perfect choice for daily drivers, weekend warriors, towing, basic off-road use, and street/strip applications. See below for some key features and tech specifications:
- Fully Machined, High Strength Nodular Case
- Raybestos Composite Clutches
- Serviceable & Rebuildable Design
- 1 Year Warranty against Manufacturer Defects
- Non-Synthetic GL-5 Gear Oil Recommended
- Friction Modifier Required
- *Note: 1963-1964 12 Bolt Truck applications require a 30 spline yoke.
- *Note: The GM 8.875" 12 Bolt Truck differential has carrier breaks at 2.73 / 2.76-3.42 / 3.73. That means if you have 3.42 gears from the factory, and would like to run a 4.56 ratio, you will need to buy a thick gear, or a new carrier. Contact support if you need help figuring out what carrier you have.
- Rigid Axle's aftermarket ring and pinion gear sets are made from heat treated 8620 steel. Our aftermarket gear set is made using a five-cut, face milled manufacturing process. Once set up correctly, this will give a square contact pattern on the drive and coast side of each tooth. We are proud of our ring and pinion lines, and you will be too!
- Remember to properly break in your new gear set! Click here for instructions!
- Our Master overhaul kits come with everything you need to replace, modify, or rebuild your differential. This will allow you to get the job done quicker, and cheaper at the end of the day. Rigid Axle master bearing install kits include:
- Both (Inner & Outer) Pinion Bearings and Races
- Carrier Bearings and Races
- Pinion and Carrier Shims
- Pinion Seal
- Pinion Nut
- Ring Gear Bolts
- Crush Sleeve
- Complete Shims
- Threadlocker
- RTV Sealant or Cover Gasket
- Rigid Axle is proud to offer our customers a full line of differential, transfer case, and transmission parts. We specialize in complete rebuild kits for domestic cars and trucks. Give us a call with your year, make, and model and we'll build you a custom kit for your build!
Applications
- Chevrolet Blazer (1969-1974)
- Chevrolet C10 (1975-1982)
- Chevrolet C10 Panel (1965-1967)
- Chevrolet C10 Pickup (1964-1974)
- Chevrolet C10 Suburban (1967-1982)
- Chevrolet C20 (1975-1981)
- Chevrolet C20 Pickup (1969-1974)
- Chevrolet C20 Suburban (1973-1981)
- Chevrolet G10 (1975-1981)
- Chevrolet G10 Van (1964-1974)
- Chevrolet G20 (1975-1981)
- Chevrolet G20 Van (1967-1974)
- Chevrolet K10 (1975-1981)
- Chevrolet K10 Pickup (1964-1974)
- Chevrolet K10 Suburban (1967-1982)
- Chevrolet K20 (1975-1981)
- Chevrolet K20 Pickup (1969-1974)
- Chevrolet K20 Suburban (1973-1981)
- Chevrolet K5 Blazer (1975-1981)
- Chevrolet P10 (1975-1980)
- Chevrolet P10 Series (1965-1967)
- Chevrolet P10 Van (1967-1974)
- Chevrolet P20 (1975-1981)
- Chevrolet P20 Series (1966-1967)
- Chevrolet P20 Van (1968-1974)
- Chevrolet Suburban (1965-1966)
- GMC C15 (1975-1978)
- GMC C15 Suburban (1975-1978)
- GMC C15/C1500 Pickup (1967-1974)
- GMC C15/C1500 Suburban (1967-1974)
- GMC C1500 (1979-1982)
- GMC C1500 Suburban (1979-1981)
- GMC C25 (1975-1978)
- GMC C25 Suburban (1975-1978)
- GMC C25/C2500 Pickup (1969-1974)
- GMC C25/C2500 Suburban (1969-1974)
- GMC C2500 (1979-1981)
- GMC C2500 Suburban (1979-1981)
- GMC G1000 Series (1965-1966)
- GMC G15 (1975-1978)
- GMC G15/G1500 Van (1967-1974)
- GMC G1500 (1979-1981)
- GMC G25 (1975-1978)
- GMC G25/G2500 Van (1967-1974)
- GMC G2500 (1979-1981)
- GMC Jimmy (1970-1981)
- GMC K1000 Pickup (1966)
- GMC K15 (1975-1978)
- GMC K15 Suburban (1975-1978)
- GMC K15/K1500 Pickup (1966-1974)
- GMC K15/K1500 Suburban (1967-1974)
- GMC K1500 (1979-1982)
- GMC K1500 Suburban (1979-1982)
- GMC P15 (1975-1978)
- GMC P15/P1500 Van (1967-1974)
- GMC P1500 (1979-1980)
- GMC P25 (1975-1978)
- GMC P25/P2500 Van (1967-1974)
- GMC P2500 (1979-1981)
- GMC PB1000 Series (1965-1966)
- GMC PB15 Series (1966)
- GMC PB1500 Series (1965)
- GMC PB2500 Van (1966)
Specifics
- Differential Model: GM 8.875" 12 Bolt Truck
- Cover Bolt Quantity: 12
- Carrier Breaks: 2.73 / 2.76-3.42 / 3.73
- Ring Gear Bolt Quantity: 12
- Ring Gear Bolt Size: 3/8 X 24 RH
- Ring Gear Diameter: 8.875"
- Ring Gear Material: 8620 Steel
- Ring Gear Rotation: Standard
- Pinion Diameter: 1.438"
- Pinion Spline: 30