So, Ellie has been at the tranny shop for a few days. She is vibrating badly in overdrive. When in drive, it doesn't shake as bad. It seems to be around 40-55mph. Also, the speedo jumps around intermittently. The shop changed the fluid and filter, which helped the lag in shifts, but its still vibrating. It was suggested that it could be the overdrive band? I haven't had transmission problems before, so this is all new and rather expensive to me..