SKel

Thank you for the suggestion. Went out and checked the Collison Box. Unfortunately we still have the buzzing noise.

My truck has had buzzing sound with both acceleration and deceleration for the past 3+months. It sounds like it is coming from the passenger side front part of floor board area. Dealer looked at it 2x then changed the differential fluid and said the noise was gone. Nope. Took to a different Diesel Mechanic shop,they had it 3 days...said they hear it but can't find it. 3rd Diesel Mechanic shop said it was the turbo actuator. Bought a new turbo kit and when he got in there said the DPF sensor was bad, replaced the sensor and ran a regen; noise quieted down for about 200 miles (didn't replace turbo/actuator). Buzzing sound is now back. Doesn't buzz when I am in N or P in the driveway and rev engine. Anyone have a similar experience? Suggestions on what it might be?