It happened to me when the tire shop bent an allow rim. They would never admit their mistake but I put the spare on the offending corner and the problem went away.

Jim

>
> On Jul 21, 2020 at 6:19 PM,  <David Boan (mailto:dboan@outlook.com)>  wrote:
>
>
>
>  Dear Van Types
>
> I just had some suspension work done that included upper control arm bushings, new shocks, 1.5" lift springs in the rear only, and an alignment (front and rear). The shop that did the work is experienced with tires and suspensions and Vanagons. After the work I had a vibration that starts at about 35 mph and stops about 45 mph. I feel the vibration in the steering wheel and shift lever. At 30 mph and 60 mph it is quite smooth. I went back to the shop and they tightened everything they had worked on. A lower bolt on the front right shock was very loose, but they did not see anything else. I drove home and the vibration continued.
>
> I am going back to the shop tomorrow and looking for a few ideas to suggest since they already said they did not see anything. For example, should both the upper and lower control arm bushings be done at the same time? Could they have knocked a balance weight off one of the wheels? If the wheel was off-balance would that vibrate all the time and not just at that certain speed?
>
> Thanks in advance for any creative ideas and suggestions.
>
> Dave B
> Boise
>