OK let's see how well I can explain this. I own a 96 4runner 2.7 manual tranny 2wd. I'm having a vibration in the drive line causing the who car to vibrate. It only happens on the highway around 50mph and up. Vibrates while under load but stops once I let off the gas. So perfectly fine cruising at 70mph. But if I put it neutral cruising at 70mph the vibration is worse then in 5th gear. Ujoints were replaced a few months ago and still solid. Anyone experienced this or have any insight?