Don't cryo treat your gears. That makes the gears harder. Which makes them more brittle not more resistant to breaking. You actually want to reduce hardness if you want to increase rigidity and strength. Sounds odd I know. I ran 550 hp on mine with a cryo treatment and the gears had visible cracks when I pulled them.
As I said before synchros aren't really the cause of our issues, it's the engagement teeth on either the hub or the gear itself. Some people have fine results with the after market synchros, but it's honestly a waste of money.
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