Suspension vibration

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blackhawk17

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I’m trying to determine what would cause a vibration in the rear suspension after hitting a bump. It wasn’t really noticeable until I added add-a-leafs in the back with my old stock springs. I’m guessing that the stiffer, newer leaf is buffeting against the old springs, kind of propagating a vibration through the frame that I can feel all the way up front.

Has anyone experienced this sort of thing? I’ve got new shocks throughout when I did a 2 inch lift, but I’m surprised it doesn’t really ride any better. I’m hoping that I just need to replace the springs all the he way around, because that’s a simpler fix than other possibilities.

The old springs do have 250,000+ miles on them, so they’re certainly due for replacement. I’m just hoping that it’s not something like my frame is old and floats around, etc.


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blackhawk17

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I’m trying to determine what would cause a vibration in the rear suspension after hitting a bump. It wasn’t really noticeable until I added add-a-leafs in the back with my old stock springs. I’m guessing that the stiffer, newer leaf is buffeting against the old springs, kind of propagating a vibration through the frame that I can feel all the way up front.

Has anyone experienced this sort of thing? I’ve got new shocks throughout when I did a 2 inch lift, but I’m surprised it doesn’t really ride any better. I’m hoping that I just need to replace the springs all the he way around, because that’s a simpler fix than other possibilities.

The old springs do have 250,000+ miles on them, so they’re certainly due for replacement. I’m just hoping that it’s not something like my frame is old and floats around, etc.


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GarrettGmc

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How's the body mounts? Just throwing a guess that mayb the mounts are worn so now it could feel worse.
 

blackhawk17

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How's the body mounts? Just throwing a guess that mayb the mounts are worn so now it could feel worse.
No doubt the body mounts do need replacing. That is something I do need to look at doing in the relatively near future.


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Eskimomann209

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were you a naughty boy and reused your u bolts?

Also did u loosen the leaf spring mount bolts?
Those are supposed to be relatively tight.. then when you drop the suspension ( put the truck back on the springs) torque them...
then after you tighten the u bolts... drive around a bit and torque them again...
That’s a clean looking truck though
 
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