Thread: Tire bump

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Is this bump happening when you drive over a pot hole or bump in the road or do you think it is in relationship to tire rotation. How old are your shocks. Check the shock mounts. What is the tire wall rating (ply) vs what you had on the truck. Do you have a spare? Use it a tire at a time if you cant find a loaner set.

Don't know what size Ford you have, but many later F250/350 4x4 models have a rear axle bump/vibration/etc at 40 to 50 mph. I had a minor one with the original Continentals at 48-50mph on my F350. With the new Kumho's it's even worse and they have been balanced twice on different machines. The vibration is at 49-52 now - whoopee, it moved up a mph. Supposedly a Hunter Road Force balance machine will fix it, but not always plus it's $25-40 a tire if you can even find a place to do them. Go to Ford Truck Enthusiasts Forums - Ford truck and SUV owners and enthusiasts Community And Information Source. and plug it in and you should have many search hits. Welcome to the world of fanny massaging via FoMoCo

Trk is f150 2wd. Old tires were also out of balance. New tires are 15"
P235 Goodyear Wranglers 2 ply. The motion is back and forth from drive
shaft. Sounds like axle problems. Dont know how old shocks are. Trk has
103,000 miles..Thanks for all the good suggestions.