Short Track Racer
Join Date: Aug 2007
Location: Alberta, Canada
Re: Manual Transmission 4th Gear Grinding Noise
The synchros are simply brass rings that look a bit like gears; they can be replaced, and as long as the (steel) gears themselves aren't chewed up, then that should be all you have to do. Now, exactly how much work it is (or how much it would cost) is something you'd have to ask your dealer about, but it is do-able.
Tell you what, handle your car the way you'd handle a loaded gun, and you'll probably be alright.