Violent drivers side rear end bounce.

hemibaby · Dec 4, 2016

My truck is driving me insane. Under 50 kph its wonderful, between 60-70 kph and randomly over 80kph one side of the back of the truck starts bouncing, to the point where i pulled over because i thought it was going to bounce off. It seems to be worse on downhills especially. Its just bizarre, goes from perfectly smooth, to shaking my teeth out intermittently. Tried new ranchos, and new Bilsteins, inspected the leaf packs, no broken leafs, new tires that have been balanced, and rotated multiple times trying to pinpoint the issue. Any thoughts? I love this truck to bits, but i have Vehicular OCD, to the point where i changed my exhaust manifold bolts and gaskets in the dark and rain because they started to tick, and the bounce has me going mental and worried about my good (For now) u-joints and other rear end components breaking....

usaf2006 · Dec 4, 2016

Sorry, no clue, but I hope you figure it out soon.

lharrell79 · Dec 4, 2016

Check the leaf bushings, and shackle bushings. Also, put jack stands under the rear axle, so the wheels/tires are off the ground. Look for play in the wheels and axles.

hemibaby · Dec 5, 2016

Ive checked for play in the wheels and axles, and their is none. What should I do to check my leaf bushings and shackle bushings? or is it just a visual check?

Rustycowl69 · Dec 5, 2016

aftermarket wheels?, spacers, yes or no, hub centric? tire size?, stock height?, no? lifted? lowered? any other mods?

hemibaby · Dec 5, 2016

Stock Wheels, Stock tire size, stock height. stock stock stock.
Just heard a random tidbit from a friend with an f150, something about having an overly tightened parking brake or parking brake pad separating and causing a shaking/bounce. Does anybody fathom how that would cause a bounce? I am almost certain that they are overly tightened on the one side that bounces. Also noticed a small bit of melted rubber on the outer edge of the rim? Idea's?

lharrell79 · Dec 5, 2016

lharrell79 said:
Check the leaf bushings, and shackle bushings. Also, put jack stands under the rear axle, so the wheels/tires are off the ground. Look for play in the wheels and axles.

Just visually check to make sure the rubber hasn't rotted out. As for the parking brake, yes it could cause funny behavior. Where is the melted rubber on the outside of the rim?

hemibaby · Dec 5, 2016

The Melted rubber was on the very edge of the rim, on the brim, right before the physical tire. I have an odd feeling that it is the parking brake though... need to adjust it tomorrow and see if that helps. The bushings are in good shape, the truck is low mileage and hasn't towed and been loaded a lot...

Rustycowl69 · Dec 5, 2016

what about air pressures?

hemibaby · Dec 5, 2016

35 psi all round. double checked with 2 gauges

Violent drivers side rear end bounce.

hemibaby

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lharrell79

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