Some people believe in this, and some think it's a bunch of crap... but did you give them time to break in though the heat cycles? You are suppose to drive it for 30 min (hot) and then let it cool off (cold). Do this three times before you romp on the car. I know it's really hard, but drive "normal".
My guess is that your carrier is blown -or- the lashing/pattern of the gears are too tight.
Either way, you need to go back to him and have him fix the problem. He should warrent it.
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