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Hey guys, I know there's really no way to know for sure what the problem is in a vehicle without actually being there to look/listen/feel etc. But, maybe someone here has had similar issues that can shed some light on what may be the probable cause. My truck has, about three times now, acted pretty strangely. When I start it up and take off in the mornings everything is all good, all up-shifts are smooth and easy, no problems.... Until I let me foot off of the gas pedal. As soon as my foot lets up on the gas, the truck jerks as if I were hitting the brakes and the engine bogs down and RPM's drop significantly very fast (it's almost like a Jake Brake effect) at the same time I can hear a "clunk-clunk" under the cab (only sometimes.) This seems to happen at any speed for that first minute or two, from 5mph to 50mph. Truck has almost 54k miles on it, with no transmission work that I know of (I've owned it for 24k miles.) This persists for about 1-3 minutes of driving and then goes away for the rest of the day. For the entire rest of the day, everything is smooth, no hard shifts, no missing, etc., just all good. It's happened about 3 out of the last 5-6 mornings. It's been getting into the high 40's at night but it's garage kept at a steady 60-65º so I'm not sure that weather/temp could be a factor...but maybe. If anyone has even a guess that'd be great! I am utterly swamped with work and new school classes and I simply do not have any free time to spare taking the truck off the road to put it into a garage for a day. At least not for another 2 weeks, once I finish my current job I'll have a couple days off I'm going to try and schedule a diagnostic appt then. Thanks guys, Joe