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I have been combating with shifting shitty gears in my brand new M/T BRZ from the day one. In actual, every gear is hard, crunchy, making funny noise when cold. Things get better and better the more the car and the transmission is fully warmed-up and as the mileage piles on.
Even at fully-operating temperature like after an hour of long drive, if you stuck in the traffic for too long, the gear will become sticky again. I need to rev the car up and do a couple of high-rpm pulls to clear the gear up.
My tip: In the morning or after the cold start, I will warm the synchros up by:
1. Reving the engine up to 2-3 K rpm
2. Cluthch-in immediately
3. Put the gear into 1st. You will feel the resistance because the synchro is trying to do its work by braking/slowing down the rotaion speed of the countershaft. Just be gentle pushing the lever into the gear position....
4. Put the gear into nutral
5. Clutch-out
And strart it all over with other gears.
This way of warming up the synchros can reduce the frustrate time I must endure with when the engine and tranmsion are cold.
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