I'm betting that water worked its way into the u-joints and/or the driveshaft. I'm making that guess based on the fact that it only happens in 4th and 5th gear and its a fast vibration.
I'm betting that water worked its way into the u-joints and/or the driveshaft. I'm making that guess based on the fact that it only happens in 4th and 5th gear and its a fast vibration.