Fixing a transmission bearing noise often times requires rebuilding the transmission. If you are mechanically inclined it is not hard to do. Make sure to purchase a transmission repair manual as it will make it easier.
throw out bearing
Remove transmission and replace front seal.
If automatic, change fluid and filter. If manual, need clutch, pressure plate and throw out bearing. If none of these work then, you are in for a real treat moneywise.
Take you car to a garage and have a qualified mechanic fix it.
put fluid in differential or have someone replace your syncros if its a manual
yes less parts to wear
Check your local library for a repair manual.
Perhaps brake pads need replacement or bad wheel bearing
Auto or manual? Auto, don't know. Manual, you can buy a good JDM one for about $500.
The seal must be replaced, which will require the removal of the transmission.
To fix a ratio on a 2000 Honda Civic transmission, follow the procedure stipulated in the users manual.
I have mercury mountaineer 4x4 03 had grinding noise easy fix remove the shaft which connects the transmission to the rear end