hello i have a question about my 07 classic. when i am driving on the hiway and my truck shifts to 5th gear there is a howeling noise coming from somewhere. also its only after the torque converter locks up and then when i let of the throttle it completly goes away. i only hear it in 5th gear with the torque converter is locked and when it goes into 6th it seems to dissapear. any help on this problem would be appreciated thanks

also ihave owned a 03 lb7 and a05 lly and niether had this noise.