2006 Mazda 3

Transmission problem
2006 Mazda 3 4 cyl Front Wheel Drive Manual 79,900 miles

I live in northern California. I am driving a 2006 Mazda 3i 5 speed manual with around 80,000 miles. My 3rd gear is totally inoperable. When I shift into 3rd from 2nd, no matter what RPMs are applied, it does not " catch" and makes a grinding sound, I assume it means the 3rd gear synchro teeth have been " ripped" off? My question is if this is so, will I need a new or rebuilt transmission? If rebuilt, how much will it cost to install? Thank you in advance, Joe.
August 23, 2010.

Check out the related content below while we wait for the question to be answered by a professional mechanic.