The Gear Box of my Charade CS 84 model is giving noise which increases gradually while shifting to lower gears. It reaches at its peak in 4th gear & is very annoying. Is there any solution to this problem or I'll have to change its gear box. If later is the case then any body having 4 or 5 speed gear box in perfect condition may please contact me at 0333-5105874. Thanx.