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It's not gonna be GREAT, but it ain't gonna burn anything up, I don't think. If it comes down to it, leave the delete pipe only on. Support it somehow, so it doesn't bust the downpipe. If you do run it downpipe only, don't beat on it. Keep the EGT's low.
I think that the rear ring and pinion is likely noisy, or the gear is set up incorrectly (which is causing said noise).
What SPECIFICALLY does the original repair order say? The heel - toe business?
Also -- if they are blaming the exhaust...have the guy roll down the road in the truck, and listen for the noise. Shut the key off. If the noise goes away, it's the exhaust (****ing UNLIKELY). The exhaust noise would have started from DAY ONE after you put it on the truck. You'd have noticed it right away, and went "What the hell is that noise?".
I think, personally, the noise is in the rear end, HOWEVER -- I have seen weird noises like this caused by driveline components as well (bent driveshaft, dinged driveshaft, incorrect driveline angles, etc.) So I'd take it to a COMPETENT shop and have it diagnosed, because it sounds to me like the guys you got working on it can't fix poop.
Hey Jeff -- I said poop again. Twice now. Poop poop poop poop poop poopity poop.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.