You get a slight tight spot with most cars when you assemble the gearbox. Tight tolerances combined with injection moulding probably the cause. As long as its not too tight to turn easily with your fingers it will bed in fine after a 5 minute run. I wouldnt worry, mine was the same. I use a small amount of ceramic grease on the gears ( Tamiya ) and also use a small bead on the gearbox casings. When sandwiched together it acts as a non-permanent seal to prevent fine dust and sand particles from getting in.
Hope this helps.
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