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Rear end jumping

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  #1  
Old 02-24-2003, 08:46 AM
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Join Date: Oct 2001
Location: Newport News, Va.
Vehicle: 2001 ford f150
Posts: 38
Question Rear end jumping

Hi everybody.
When I go over an uneven bump or something my
trucks rear end will jump a little to either side.
Then I have to watch my steering to make sure I
stay straight. Can anybody help me? Thanks in advance
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Old 02-24-2003, 12:13 PM
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Location: Newport News, Va.
Vehicle: 2001 ford f150
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Is this a suspension problem or shocks?? anybody?
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Old 02-24-2003, 12:37 PM
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Join Date: Dec 2001
Location: Northridge
Vehicle: 2004 Ford F-150
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It could be a stuck shock or a binding leaf spring but I doubt it. Try getting a friend to bounce on the rear bumber (try both sides) and see if the suspension is compressing and not just the tires. If it does your truck is probablly okay suspension wise. You can also check the air pressure in the tires for over-inflation. My truck was 6 pounds over from the dealer. Then assuming all the parts on your truck are fine, you may just be hitting the bumbs a little too fast. This will cause the back of the truck too jump out like you describe(especially in a turn). Remember there is no weight on the back end of the truck, this is why they spin out easier than cars, spin the tires easier (aka traction problems under hard acceleration), and bounce around when you hit bumps. Trucks are sprung hard from the factory so they can handle the weight of towing and hauling of materials. If you want a cushy ride that will not bounce, air bag the truck and it will be a lot smoother than the stock leaf springs. By the way, my truck feels like the back end jumps if I go over a speed bump too fast. I think it is just being a truck.

Brian
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Old 02-24-2003, 02:32 PM
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Location: Bakersfield, CA, USA
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Side to side movement over uneven bumps is a characteristic of vehicles with simple leaf spring rear suspensions. The wimpy stock shocks don't help.

The only thing keeping the rear end 'straight' under the body is the leaf springs. When the body wants to go to one side and the rear end wants to go to the other, the leafs bend and things get whacky, especially if you are driving hard.

More sophisticated suspension designs do a better job of keeping the rear end in its place. But leaf springs and live axles are cheap and allow plenty of room for the bed.

I don't know if anyone makes a Panhard rod or leading links for our trucks, but these would help with this problem. BTW, a rear anti-sway bar will not help much as the bar also bends side to side pretty easily.
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