I have a d40 auto 07 on a recent trip to Melbourne towing a 2.2 tonne van at about 90 kmh i put it into overdrive for about 10mins on the flat and noticed a bad vibration i thought it was the road and it went away after a few mins i then put it back out of overdrive and carried on for a while then i tried it again in overdrive and the vibration came back while it was vibrating i locked it back out of overdrive and it stopped as soon as i hit the button does anyone know what could cause this.
Ozzie
Ozzie