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Discussion Starter · #1 ·
2007 classic ext cab shorty bed. Installed 2" drop spindle. Flip kit with rear spring mount for 4" rear drop. Wiggles in rear between 60-70 mph. Seems like it comes and goes. Shims didn't seem to change. Rebalance tires didn't seem to change. Anybody have an idea? Thanks in andvance.
874299
 

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Check your shock extension hangers if you have them. My 2020 had that issue and that was the problem


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Wiggles or vibration? If you have vibration maybe your pinion angle is off.
 

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May sound like a dumb question, but have you noticed it doing it about the same location on the highway? I've had some customers' lifted and/or lowered trucks oscillate (wiggle) at certain speeds, on specific stretches of road. Chalked it up to frequency oscillations in the suspension caused by the road surface conditions. My own truck does that, only in certain spots about 73 mph. Threw a load of old bricks in the back, it went away.
 

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Discussion Starter · #8 ·
May sound like a dumb question, but have you noticed doing it about the same location on the highway? I've have some lifted and/or lowered trucks oscillate (wiggle) at certain speeds, on specific stretches of road. Chalked it up to frequency oscillations in the suspension caused by the road surface conditions. My own truck does that, only in certain spots about 73 mph. Threw a load of old bricks in the back, it went away.
Agree I think that may be the answer. But it didn't do it until lowering. Just annoying. Going to try balance again and may some wheels and tires of my other truck. I am determined to find a solution. Thanks
 

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That's what I'm thinking, my OBS didn't do that until I lifted it. We'll see what it does when I lower it.
 
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