vibration/noise at speed
'97 4.6l stock, bilstein shocks, Firestone Firehawks, stock rims
A few months ago my bird starting having a drive problem. When I get up to about 50mph and then release the gas, I get a vibration that continues until I throttle up again.
At about 65-80MPH I get a very annoying, low frequency noise, kind of like road noise from tires. When I get accelerate, the noise goes away for a second or two and then comes back.
Took it to my local tranny shop. They did a test drive. They think it might be a problem with one of the half shafts but they can't get it on the rack for another week.
Anybody have any other ideas what this would be?