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89 PU bouncing at highway speeds.

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Old 08-22-2012, 06:17 AM
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89 PU bouncing at highway speeds.

Driving my yota the other day i noticed that when im doing over 50, my truck will lightly bounce a few seconds and then stop. Then a few seconds later it does it again.( By bounce i mean it feels similar to driving over a rough surface like gravel.) My first thought was bad alignment, or chopped tires, but tires are wearing very smooth and it drives straight as an arrow when i let go of the wheel. Its been doing this for a while (about a year) so its probably not a serious issue, but i would like to get it fixed. Has anyone else had this problem? If so how did you fix it? Thanks for the help.
Old 08-22-2012, 08:28 AM
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When my truck was new-to-me, at highway speeds it vibrated enough to feel like a tire out of balance. It turned out one of the tires had a "hop," and it was replaced by Goodyear under warranty.

This is different than what you describe; I had the vibration all the time.
Old 08-22-2012, 01:27 PM
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What kind of condition are your shocks in?
Old 08-22-2012, 01:52 PM
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I haven't replaced the shocks since i had the truck and i don't think the PO did either. They could very possibly be the factory shocks. They don't seem to be really soft or hard, but they probably need replacing. I was thinking it might be the shocks, but i figured id ask before replacing them.
Old 08-22-2012, 03:32 PM
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I bet that's exactly what it is. My shocks are toast as well and I get the same characteristics you speak of.
Old 08-22-2012, 07:54 PM
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My votes also for shocks. My 94 truck felt drove terrible before I did new shocks, almost felt like it was trying to leave the ground
Old 08-22-2012, 09:49 PM
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another vote for shocks here

Shocks was the first thing to come to mind when reading your post
They are not preventing your spring from oscillating/porpoising
my guess is the air/nitrogen charge is gone, if disco one end and compress it and does not return on it's own it is shot
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