Hello everyone. Took my 04 CC 4x4 PSD 6.0 47XXX miles, in for oil leak (2nd time) and Tranny fluid flush. They pulled the tranny to replace the rear main seal. I drive home (about 12 miles) and hear a knock comming from what sounded like the top end when I pull into my drive? Sorta went away with increased RPM, and I heard nothing driving home. So with the motor running I check the Tranny fluid dipstick. Nothing, dry as a bone. I shut it off. Let it sit a minute. Check the engine oil and it's fine. Pull the tranny dipstick and now it's reading at the tip of the dipstick nice red tranny fluid. The truck shifted fine, actually better than before so I suspect they did not fill the tranny all the way. (only charged for 10 quarts of tranny fluid on the bill too!) But the knock has me a little worried. Also, when I restarted the truck the knock took a few seconds to develop. Any thoughts? Only mods are AFE intake, Zoodad, 4' Turbo back, no cats or mufflers.. Oh yeah, called the dealer and the service manager sent a wrecker to my house! Thoughts appriciated!