Auburn Grip-N-Loc® Differential 12 Bolt (3 - series car) -- 30 Spline
NEW Grip-N-Loc® Limited Slip Differential: Built to exceed your expectations
Welcome to Auburn Gear’s most advanced limited slip differential, the Grip-N-Loc®. It builds upon exclusive technologies previously found in our limited slip line, but is even more robust to satisfy the extreme demands of serious drivers. If you push the limits of performance and traction, perhaps through competition, or simply through extreme weather driving, Grip-N-Loc® is your best choice.
Benefits of the Grip-N-Loc® Limited Slip Differential
- Upgrades your vehicle for safe transfer of increased power/torque across the axle.
- Case material is up to 50% stronger than OE cases.
- Advanced cone clutch technology provides 25% increase in bias ratio/increased traction.
- Heat-treated, hardened-steel gear materials for confidence in extreme conditions.
1. Increased Bias Ratio – Improved Traction
The bias ratio of spring-preloaded limited-slip diffs varies significantly. As torque on the low traction wheel increases, the bias ratio decreases. For example, if we look at the bias ratio at the “Ice Line” (where the low traction wheel is on ice and its coefficient of friction = 0.1) the typical bias ratio will be approximately 4.5:1 up to 5.0:1.
As the low traction wheel gains traction the bias ratio will decline, delivering more traction to the lower traction wheel. For example, if the bias ratio is taken when the low-traction wheel experiences a .20 coefficient of friction, the bias ratio is only 3.0:1 to 3.5:1 (tire size and weight will also alter these values).
IMPORTANT – Average Bias Range with both axles on similar ground is 3.3:1 to 3.5:1. However, when one of the tires encounters ice or snow, the bias ratio increases to 4.5 to 5.50:1. This means, the differential as a torque multiplier has the ability to transfer up to 5X the torque of the low traction wheel across the axle to maintain vehicle traction.
2. Case Material Optimized for Durability in Extreme Conditions
Auburn uses different grades of Nodular Ductile Iron case material depending on the application. Original equipment manufacturers typically use lower cost, less durable iron case material.
Additionally, OE cases are typically designed to optimize material cost/weight versus warranty cost considerations. Auburn products have greater mass and are made out of higher grade, more expensive materials. While not universal, in most applications Auburn diffs provide a case design that’s up to 50% stronger than OEs.
IMPORTANT – Auburn differentials are built with strength and durability in mind. We do not reduce material to achieve weight savings that compromise strength. Auburn differentials are specifically designed to provide confidence to enthusiasts who are upgrading their vehicles to put more power through the driveline and more torque through the axles.
3. Hardened Gear Material Minimizes Wear
High strength hardened steel is used for all of the gears in all Grip-N-Loc® applications. This material minimizes wear, adding long-lasting durability to moving parts and increases driver confidence in extreme conditions.
4. Gear Tooth Design…Exclusive Cone Clutches
Grip-N-Loc® continues the Auburn Gear tradition of using Cone Clutches to drive axle shafts. In Grip-N-Loc® we have optimized gear design for greater impact strength and toughness, rather than focusing on the cost versus warranty equation. The unique geometry of our side gear and cone clutch assembly increases overall durability, providing greater impact strength and overall toughness. For the high performance driver this provides the ability to push more horsepower through the differential to the wheels, without risk.
5. Exclusive Cone and Cup Design
This exclusive design has been the heart of our limited slip products for many years. A cone clutch side-gear unit creates friction with the carrier to drive both tires. The cone clutches couple with beveled side gears, providing highly efficient torque transfer to the axle shafts. As torque is transmitted to the axles, the side gear separating forces and preload spring seat the cones firmly against the differential case. The amount of force applied to the cone bearings determines the differential’s torque transfer capability. When torque levels decrease, as in a cornering maneuver, the gear separating forces also decrease, allowing the axle shafts to rotate independently and the wheel with the most traction receives the most torque.
6. New Cone Clutch Design for Increased Durability
The exclusive cone clutch design described above has been the heart of our differentials for many years. But Grip-N-Loc® cone clutches have been redesigned to provide increased durability.
Competitive testing showed Auburn diffs have very good retention of the torque bias characteristics. This testing was integral in driving us to change from a spiral (threaded) cone design to a new “grooved” cone design that has better wear resistance properties when forced to slip at higher speeds. A change in the cone angle takes further advantage of the improved wear characteristics resulting in an additional 25% increase in bias ratio for better performance.
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Application: GM 12 Bolt (Car)
Ring Gear Diameter: 8.875"
Carrier: 3 - Series (3.07:1 to 3.73:1)
Side Gear Spline: 30 Teeth
Model Years: 1964-1972
Bearing Cone: LM603049
Bearing Cup: LM603012
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Make/Year
- Chevrolet 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972
- Chevy II, Chevelle: 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972
- Camaro, Firebird: 1967, 1968, 1969, 1970, 1971, 1972
- El Camino: 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972
- Grand Prix, Monte Carlo, Nova: 1970, 1971, 1972
- GTO, Lemans: 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972
- Olds F-85: 1968, 1969, 1970
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Product Description
From over the road daily driving to muddy trails and back roads, Auburn Gear's high bias Pro Series and High Performance Series limited-slip differentials outperform standard OEM differentials hands down. They deliver more traction and faster engagement for controlled power transfer and lightning-fast reaction to changing load conditions. No matter what your application - performance or passenger cars, light duty trucks, vans, sport utility vehicles, off road, or recreational vehicles - the Auburn Gear limited-slip differential is engineered to provide smooth torque-sensing operation with bias ratios to meet your performance needs. This superior performance is achieved through an innovative cone clutch design which transfers more power to the high-traction wheel for quick acceleration and tight cornering. Auburn Gear has a full range of differentials for Chrysler, Ford, GM and Toyota vehicles. All are also compatible with all ABS and electronic controls.
How the Auburn Gear Limited-Slip Differential Works
The highly efficient torque transfer capability of the Auburn Gear limited-slip differential is achieved through the use of cone clutches coupled to beveled side gears. As torque is transmitted through the differential side gears to the axle shafts, the side gear separating forces and spring pre-load firmly seat the cones into the differential case. The cone design, along with the applied force, determines the torque transfer capability of the differential. When torque levels decrease, as in a cornering maneuver, the gear separating forces also decrease, allowing the axle shafts to rotate independently. All Auburn Gear limited-slip differentials are designed to provide the maximum amount of torque transfer without compromising the performance requirements of a vehicle in situations where torque transfer is not required.
State-of-the-Art Design and Test Lab
You get exactly what you specify -- faster and at a lower cost -- with Auburn Gear's CAE/CAD system, complete with Finite Element Analysis [FEA]. This system allows us to develop and optimize the differential design for your requirements.
These designs are challenged in the real world with our prototype testing labs, where every aspect from metallurgical properties to mechanical performance is proven against the design parameters. Our axle dynamometer tests the differentials to prove the design under load conditions while computer-aided manufacturing systems produce components to individual design specifications.
But testing is not confined to in-house labs alone. Our unique on-site testing capability brings engineers right into the field to prove the design of our limited-slip differentials under actual working conditions. Differentials are subjected to a variety of rigorous vehicle tests to assure you of getting the high performance reliability you need.
Located in the industrial heartland of America, Auburn Gear has the capability and capacity to meet increasing world market demands for traction-enhancing differentials, all while maintaining and improving every aspect of design, quality, delivery, and price which translates to total customer satisfaction for you.
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