Faulty Bearing

Sound are heard when I engage the 1st and reverse gearof my Toyota KE70.

Reply:
If the sound is heard when you engage the gear and the release the clutch, then it is likely that you have a worn bearing in the gearbox. The replacement of bearings in the gearbox is a reasonably straightforward job and can be done by any decent mechanic.

If it is a worn prop-shaft bearing, the noise will be there in all gears.