Drivetrain AT/MT Drivetrain discussions on the 240sx and Silvia

Synchros?

Old 08-20-2006, 09:44 PM
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Synchros?

How likely is it that both my 1-2nd gear synchros and 3-4 gear synchros went out at the same time? The transmission has the problem where i have to be almost stopped to get back into first and it now grinds (sometimes lightly, sometimes a little harder) going into every gear but reverse and 5th. When I double clutch it shifts better, but i dont have to rev-match to get it to shift fine, the RPMs just fall to 700 and it shifts fine no matter what the speed is. How likey is it that i just need tranny fluid? The problem started lightly with third gear and now all the gears do it on every shift. Synchros arent something I want to tackle, but where could I buy them if i have to. I searched autozone's website and they dont have them. Neither does Courtesy Nissan. Do I have to go to the dealership?
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Old 08-23-2006, 05:04 PM
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first gear lockout... dont force it
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Old 08-23-2006, 07:39 PM
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have ya checked the clutch master and slave cylinders?
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Old 08-23-2006, 08:21 PM
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bennieb has a good point. If your clutch isn't disengaging properly, grinding gears could be a sign of this. It makes a sense that your reverse gear isn't griding because the reverse gear is never synchronized. Not sure about 5th though, I'm not a mechanic.
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Old 08-24-2006, 09:17 PM
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have you changed your gear oil? my 240 had been doing the same grinding i went to the sports car only shop by my house and they sugested red line full synthetic gear oil (mt-90) i changed my gear oil and my gears go in perfectly(these 240's are prety old and alot of people neglect to change their gear oil)
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Old 08-24-2006, 09:19 PM
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P.S. changing your diferencial oil might be a good idea 2
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Old 08-25-2006, 05:17 AM
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Yeah I bought some royal purple, but my drain plug is stripped... i gotta get on that
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