What do you mean by a "jump" in the rear drivers side?

 

Hop, skip or what ever you want to call it. Above about 35-40mph the drivers side jumps up and down like its going over rumble strips. the passenger side does not and the truck didn't do it when I bought it so I'm thinking after the other stuff I did that its the bearing. The oil seal is leaking a little as I noticed when putting on rotors and brakes last week so I'm changing the bearing on that side.

 

Have you had your tire checked for a separation?

 

brand new tires. the first thing i did was rotate, rebalance and line the truck. Same hop. Next I put on new shocks then rotors and brakes. I thought Bearings next then I'm not sure.

 

Bent axle ?

 

Is there a significant amount of weight in any of the tires? Just cause they're new doesn't mean you didn't get one out of round.

I don't believe an axle bearing would cause that sort of issue. You'll know if the bearing is bad just by looking at the axle shaft when removing it. It'll take be really pitted or even scored. The only fix at that point would be to try an axle saver bearing or replacing the axle.

 

I'm discounting the bent axle scenario as it did not have the hop when i bought it and I have not done anything that might have caused it. I'll know if the bearing is bad when I pull the shaft. I am trying to run down the hop step by step and replacing the bearing is the next step.
Thanks for the posts on this

 

I had same thought, just changed mine and did not grease, my concern was for mixing both bearing grease and gear lube so I opted to pull out of garage and run it 50’ on a side hill both ways. 🤷🏼‍♂️

 

Seems that amount of movement in the bearing would crush/shred the oil seal. I would jack up the rear end and watch the tire as the speed comes up. Shaking like that could be a combination of things like a failed shock, an out of balance drive shaft or failing universals. I had a Bonneville years back that did a similar thing and I traced that to a bad rotor casting after multiple tire balances. You have replaced your rotors so you’d think the new ones were balanced but you should still look at it.

 

A hop feeling on driver's rear only?
1) Likely a left rear parking brake not releasing because of a rusty park brake cable.
2) Bent axle maybe, or bent wheel or tire but you said you rotated the wheels and tires, so back to the axle. If it was a bad bearing, be pouring lube out and brakes would be tore up.