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Vibration issue from rear

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Is this normal for the 08.5 steering?

REC Radio repair

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I recently traded so I'm still learning this truck. Had a regular bed on it. replaced with steel flat bed. That vibration shows up at 70-80 mph from the rear. pulling a heavy trailer is smooth sailing. empty trailers or half load it still has the shakes.
truck came with new good year wrangler tires. I checked rims on the rear, 3 of the 4 are bent 1/8 to 3/8 out. I added stop leak, which did help some. U joints are all good. Left rear hub had a slight wobble to it. I pulled axle and was abe to tighten nut 1 more notch to lock ring to nut. What a difference this made....until I hit a rough bridge. started again but did settle down at the next bridge ( not as rough). There is only 2 threads the snap ring can lock on to. I thing I should check bearings on both side and replace if needed.
I think this one was wrecked at on time.
Any thoughts?
 
I bought my truck brand new , and from day one it had the 70mph vibe. Long story short I spaced my center carrier down 1inch and my vibration went away. In my opinion the center carrier bearing sets to far away from the knuckle and puts stress on the driveline joints between the two drive shafts(especially under acceleration) Kind of like putting a swivel socket on an extension, you have to hold up next to the socket to control it. Spacing the carrier down put the two drive shafts in line with each other. I don't know if this will work in your situation , but it fixed mine...Good luck
 
Rims and rotors, 2 of 3 main causes of vibes. If the hub was wobbling time for new wheel bearings also. Replace all of those and go from there.
 
I found it. U joints all good, bearings on the case had play. Slip yoke had play. Replaced the case, slip yoke and she is good.
 
I found it. U joints all good, bearings on the T case had play. Slip yoke had play. Replaced the T case, slip yoke and she is good.
 
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