How to Adjust Slapper Bars
When rear-wheel drive vehicles quickly accelerate from a stop, the torque from the engine causes the differential to twist. This twisting motion results in a flattening of the leaf springs, which in turn causes the rear tires to move upward and slip across the pavement. This loss of traction increases the amount of time it takes the vehicle to accelerate. Slapper bars bolt to the bottom of the leaf springs to minimize flex, which pushes the tires downward to increase traction. Slapper bars only work if correctly adjusted, but doing so usually takes only a few minutes.
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Instructions
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1
Position the slapper bar onto the leaf spring so that the axle shaft is in the center of the bar's two mounting brackets.
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2
Remove the rubber snubber at the tip of the front of the slapper bar by removing the bolt from the bottom of the bar with a socket wrench and pulling the snubber out of the bar.
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3
Slide the rubber snubber into the hole on the top of the bar that positions the snubber directly underneath the eye of the leaf spring.
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4
Measure the distance between the top of the rubber snubber and the bottom of the leaf spring's eye with a ruler. This distance must be approximately 1/2 inch. Mark the 1/2 inch point on the snubber, because the excess snubber material must be removed.
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5
Cut through the tip of the snubber with a hack saw at the mark made in Step 4.
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6
Position the snubber into the hole found in Step 3, then install and tighten the snubber's retaining bolt with a socket wrench.
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