Hello all, just noticed last week that my truck is making an odd buzzing noise under load, mostly when taking off from a stop or under 5 MPH. I've been looking underneath the truck and can't find the culprit, it must be a loose heat shield or a loose exhaust clamp. Anyone had similar issues before? It's driving me nuts and I can't figure it out.

 

Is it a buzzing, or is it more like a moaning sound accompanied by vibrations when shifting from P to D, D to P, P to N or N to D?

 

It's buzzing, the vibration of the noise increases when I apply more pressure to the throttle.

 

Ok, then it's not the separator plate issue in the transmission.

Do you only hear the noise when the truck is moving?
if you rev the engine with the truck in park do you still hear it?
Do you hear it while the truck is moving with the transmission in Neutral?
Does it go away when applying the brakes?

 

I can hear the noise at idle (slight buzzing)
If I rev the engine in park It gets louder (still buzzing)
Haven't tried it in neutral while moving yet.
Seems to stop when I take my foot off the throttle.

 

It's probably one of the clamps that help hold on to the little heat shield on the exhaust piping towards the front of the truck.My 2011 did the same thing.Turns out one of the clamps mentioned rusted/broke,resulting in it rattling on the pipe,also allowing the heat shield to rattle.New clamp tightening it down again solved it.

 

Found the culprit. It was loose on the transverse pipe behind the oil pan.

 

Bingo.
Glad you caught it.Easy fix,new clamp.

 

Did you replace with the same style clamp?