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Its there to prevent wheel hop under high torq from the rearaxle. ( dampening axle wind up.)
 
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The strange thing about it is that many trucks get it while many don't. True on the Gladiator also, which shares a very similar design.
 

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They wouldn't need it if the four links had really stiff bushings but that would make the ride suffer. Suspensions are always a series of compromises. This is needed to control axle warp under HARD acceleration since they chose softer bushings on the four upper/lower links that hold the axle in place in forward and reverse directions.
 

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They wouldn't need it if the four links had really stiff bushings but that would make the ride suffer. Suspensions are always a series of compromises. This is needed to control axle warp under HARD acceleration since they chose softer bushings on the four upper/lower links that hold the axle in place in forward and reverse directions.
Good explanation.
 
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