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I'm not really sure why you never experienced this in the past though. If the input shaft is turning then it's going to propel the car forward when you put it in gear. The only thing I can think of that would exacerbate this would be maybe you changed tranny fluid so something that lets the internals spin more freely for longer and/or maybe your tune raised your idle a little causing the shaft to spin longer. The syncros really are irrelevant with regards to the car moving though. If the input shaft is spinning and you lock it to the output shaft then the car will move. If your having difficulty putting it into the gear then yeah that could indicate the syncros are wearing. But the variables I listed (fluid and/or idle speed) could also impact the syncro's ability to work.
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