Powertrax Lock Right 1920 Locker for 1978-1988 GM 8.5 differential. Tired of blowing out spider gears in your open case differential? Powertrax Lock-Right Lockers are brute force devices for rugged truck applications. Best suited for extreme off-road to severe on-road use. Proven in the most demanding applications worldwide. They provide the best value for greatly increasing the tracion of both 2 wheel and 4wheel drive trucks. The Lock-Right has been used in the harshest comditions by hard-core off-roaders, in towing applications, and even United Nation vehicles in rugged terrain. Fits the GM 8.5 differential having a 10 bolt cover and 28 spline axles.
Because the Lock-Right eliminates wheel spin, therefore its associated driveline trauma is negated, the strength and integrity of the surrounding original case and other driveline components are in effect, substantially increased. Cases that occasionally fail with open or limited slip/posi differentials become one of the strongest links in the drivetrain when equipped with the Powertrax Lock-Right Locker.
The Lock-Right's operation is fully automatic. Designed to send the engine power to the wheels with the most traction, the Lock-Right will help get you where you want to go. While traveling straight the Lock-Right will lock the axles together similar to a spool. However, when the wheels need to differentiate in a turn, the Lock-Right will allow the outside wheel to rotate faster to complete the turn. The internal gears on the Lock-Right will overrun each other, to allow this differnetiation. When operating off-road, the Lock-Right will always send the engine power to the wheels that need it most. For example, if you are on a slippery surface with one wheel slipping, the other wheel will receive the engine power and keep you going. Whether it be snow, sand, mud, ice, etc. The Lock-Right will give you the traction you need.
Installation is simple because the ring and pinion setups are not altered. You are simply replacing the spider gears in your existing, stock differential case. No special tools or oils are required for installation. Can be installed by a good home mechanic. Detailed, model specific installation instructions are included.
NOTE: In some vehicles, you may hear a light clicking noise as the gears are overrunning themselves and allowing the wheels to differentiate in a turn. This is normal. For quieter, smoother operation, we recommend the Powertrax Traction System, found in the truck differential section of this website.
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