Well, it turns out my Jake Brake isnt that at all

[sjreno]

I originally brought the truck in to the dealer for a routine oil change and to have the rear diff seal re-done due to leak at 33,000 miles. Everything went smooth until a couple days later when the truck started making this "Jake Break" sound whenever I let off the throttle. I bring the truck back, and I get a call 3 hours later from the service manager admitting that something was "overlooked" when they did the new seal.

[DoubleDpsd]

huh? sooo.....do you know what was 'overlooked'? I don't see how overlooking a rear differential seal would cause turbo issues. Are you building boost and then letting off the throttle? Do you have a stock intake? What you're describing sounds like "turbo fart".

[sjreno]

My truck is bone stock. If you ask me, the tech that was assigned to change the seal "overlooked" putting new fluid back in the diff which in turn started the humming and vibrating from the rear diff. which sounded like a Jake Brake Noise to me. Nonetheless, the service manager said they would take care of it.