i have a shutter but only when maintaining speed around 60mph you can feel it come and go randomly only for a second at a time. also when it up-shifts while not accelerating (coasting/downhill) it shifts very hard into 3rd, other gears are not as bad, same with downshifting but it happens in random drive-cycles, some days it will be fine and then next day on my way to work BAM slams into 2nd and 3rd going down my hill.. it does worry me as i just bought this truck with 80,000 miles on it. very clunky trans but seems to run smooth when mildly to hard accelerating.. i try to baby it while driving but that seems to be when the clunking and hard shifting happens most. shifts great when i get on it hard