wheel hop? like bouncing? take it to get road force balanced, also make sure you get it balanced RIGHT.

Stock rims are hub centric, aftermarket rims are lug centric, and they need to be balanced that way on the machine.

 

Rims are stock, not sure how balanced. It seems that symptom was a tire/wheel out of round.
I want to get it on a lift and observe effect when run the speedometer up to xx mph and see if any shaking, vibration occurs. Also mount a dial indicator and check drive shaft for runout.

 

I am a little confused about what is happening.

Do you have vibrations or is your truck actually jumping off the ground?

I think your tire size is probably P265, etc. If you have now had 2 sets of tires and are experiencing the same symptoms, it's not the tires. Next is to isolate what the truck is actually doing so we can shoot ideas.

None of which you have already stated as potential problems would cause the truck to 'hop'.

• Driveshaft could be out of balance. Look for evidence of a thrown weight.
• One of the axles could be bent. Raise vehicle. Disengage 4x4. Properly secure rear axle and chock front wheels. Remove rear wheels. Engage vehicle to 1st gear and watch the axle flange for a wobble.
• Rotate wheels around the vehicle to see if vibration moves around with the tire rotation. Potentially a bent wheel.
• Bad rear wheel bearings

Can you have somebody drive the truck while you follow - look for a wobbly wheel

 

how were the shocks tested? pushing down on the back bumper is not a valid test imo, i suggest removing just the bottom bolt and compressing it and notice how fast (or slow) it extends back to starting position ... at 125k, maybe week leaf springs. post a picture of rear leaf springs if possible ... just a few ideas to think about ...

 

At 125k your shocks are gone if they are stock.
They make look ok from outside but would not provide any dampening.

 

Thanks for all the responses.
The symptom is vibration on back end. I will take to a shop that has a lift and make the suggested checks.

I have no idea what "road force balancing" involves. I will be going to a Goodyear dealer that should know what that term means.

First check will be to get the wheels off the ground and spin them up to speed indicated on the speedometer where shaking/vibration takes place. Then check shaft, remove wheels and look for wobble on axle flange. Bad wheel bearing should be noticeable audibly.

 

How are you planning to test the part when you say spin tires up to speed? On your own or in a shop?

 

The shocks are not originals, and "feel" OK.

 

Ok so let me get this straight....

1. Bought the truck and drove it with no problem for 6 weeks.
2. Changed tires and experience vibration in rear end
3. Change one bad tire and remount and now it vibrates up front.
4. Change to a new brand of tire and have vibration again on the back.

The only things I know that would be causing this is:

1. Bad u-joint
2. Out of balanced shaft (you should have a 2 piece driveshaft?)
3. Tire separated
4. Wheel is bent
5. Tires were not balanced correctly before they were mounted to your truck.

If the shop only changed your tires and nothing else then it has to be tires unless the first set you had had a separated tread and cause a joint to go bad or a weight to come loose from the driveshaft. Let me know some more particulars I'm happy to help out

 

I did not drive for six weeks with no problems. I replaced the tires about 2 weeks after buying the truck. It had a type of off road tires that were rough and noisy. It possibly had the vibration then, but was masked by the tire rumble. With hi way tread tires, the vibration was obvious. At least 2 of 6 Cooper tires that were mounted were defective. At that point I requested that the Coopers be replaced with Goodrich brand. Great improvement, but still some vibration that shouldn't be there.

I will have tires spun on the truck at a local Goodyear shop. I will check for visible and tactile vibration/shaking. Results will be noted. Next, wheels will be removed and same test will be repeated. If vibration is not evident, wheels will be checked for defects. If vibration is still evident, drive shaft(s) and U-joint(s) will be checked. I still have no knowledge of "road force balancing".

 

Check the rear axles to make sure they are not bent. You should see the wobble when the vehicle is on the hoist.

I wondered if you'd be doing any of those tests at home. No need to check axles your own if you are taking it in.

 

also check the driveshaft center support bearing could be getting vibrations from there if it is worn.