135 bounces per minute on the highway

[K10-Kansas]

Originally Posted by LONGHAIR

A bounced like that is normally a tire issue, either very out of balance or a big ol knot, from a broken belt.
Balance problems start showing up around 45mph, but it depends on the diameter.

That ended up being the exact problem. I jacked up the truck, spun the tires and sure enough they weren't round.

So I took a bed frame, cut it up and welded it together with 2 sets of drawer slides and strapped a grinder to it. I put the truck on stands and ran it in 4 low lock and trued the tires. Worked perfect. I drove on the highway today and the bounce is gone!

Here is a video of it running https://youtu.be/m-gSHW6Vx88