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There's the clunking sound....

Pics of the carnage

Well, after $1800 at the diesel mechanic they threw up their hands and said the noise was a mystery to them. So I took it back to our shop and started going over what I thought could be the cause. Drained transmission. Only a flake or two on the magnet. So I drained the forward rear axle...

I heard it immediately yesterday evening on my first trip out to the pit with the window down. I heard it as a car passed by me and the sound was reflected off the car. My boss and I have been driving it for months, windows up, headphones on so I have no idea how long it's been doing it. I...

I'm in the lowcountry of SC, there aren't any hills anywhere near me! I do know when I'm pulling out of the pit with 20 tons of dirt on it there is no knocking. That's usually in 2nd or 3rd gear, but the dirt ramp is only like 40 yards long. I don't know if that is enough of a run for it to...

The knock gets progressively faster the faster you go in each of the high gears. When you shift into 13 there is no knock until you get almost to the shift point. Once you shift to 14 and get back on the throttle it starts again. Same for shifting to 15 and 16. Once in 16 it gets progressively...

I have a M917 dump that has developed an odd clunking or knocking sound. The truck only makes the noise when accelerating or under load and only in 14-16 gears. Zero noise in 1-13 gears. Any ideas what might be the cause? Engine runs fine and transmission shifts and engages perfectly. No power...