Why is the 3rd gear making a grinding noise.

[brandon]

I am not able to shift my gear to 3rd gear as when i do it makes a grinding noise.

Why am having this problem?

[harryh]

You don't say what model of car. Some Mechanics may also suggest some liquids like Taco15 syncro mesh fluid to neutralize that tiny grind in ur tranny. Changing the transmission fluid might help but I doubt it.

The transmission housing may be probably cracked. Usually, this will misalign the gear shafts and cause grinding between gears.It don't require a new transmission - just the syncro to be replaced. Which depending on how old and how many miles are on your Mazda car you might just want to have it rebuilt or a new tranny installed since the tranny has to be disassembled anyhow. Unless you're expert at rebuilding manual trannies, I suggest you have it done by a specialist professional. It's not diffucult to fix, but it's also easy to mess up if you don't know what you're doing.The synchromesh is what helps the gears to engage smoothly without grinding when you depress the clutch pedal.