1963-1987 GM 12 Rear Differential Cover (YP C1-GM12T) Engine Components>Timing Chains most complete front-end upgrade for

most complete front-end upgrade for your GM HD truck

4 Flash Patterns

ensuring significant power gains and improved throttle response without the need for an aftermarket tune or the risk of check engine lights

adjustable pattern speeds

1963-1987 GM 12 Rear Differential Cover (YP C1-GM12T) Engine Components>Timing Chains most complete front-end upgrade forPrecision engineered Yukon Differential Cover built for reliable performance and direct fitment. Yukon Gear sets the standard for quality drivetrain components. Features Differential cover Chrome Cover for GM 12 bolt truck Chrome cover for GM 12T These Yukon replacement diff covers take your rig a step beyond the boring factory look. They are the stock OE design finished in chrome Fits GM 12 bolt truck Application Notes GM 12 Bolt Truck; Chrome