Peugot 106 - Key Largo - Whenever I change gear my car makes a 'clunking' sound - Help!

l know this only happens in manual transmissions where the clutch linings are already thin. In automatic transmissions, maybe you need to have your gear box checked.

could be a u-joint is worn out. but it also could be slack in the transmission or rear end if it is a rear end drive. check out the u-joints first- that is the most likely problem, and the least expensive to fix.