Muffler

Couple weeks ago we had a truck come that had a big banging sound every time the driver would accelerate. From how loud the banging noise was everyone in the shop thought it was something really bad. Well the foreman first wanted us to adjust the valves and the engine brake because it seemed to do the loud bang most when the engine brake hit. Well that didn't solve the problem. But the truck had gotten a new clutch put in couple weeks before, so foreman said pull the transmission out there is probably something wrong with that, a new clutch really didn't solve the problem. Well now the next thing he wanted to do was drain the rear end oil to see if there are any big chunks, they were good. So we sent it to another shop, they said the truck needs a new EGR so they threw a EGR at it. Still doesn't fix the problem. They tried some other things and that shop gave up. So i drove it back to the shop and i thought it was a good idea to just stand on the back of the truck have somebody drive in the yard going 5 MPH and see where the noise is coming from. And low and behold it was coming from the muffler. I took the muffler off drove it around the yard with out a muffler problem solved. That muffler costed $80the shop spent close to $10000 trying to figure out what is wrong. The biggest thing i learned from this is to stop and think back to the basics instead of thinking all these big problems and when someone just wants to through parts at a truck tell them why not to do that. Fixing something with sold evidence costs a lot less money as well. Here is are a couple pictures of the muffler.