Hi guys, i've a '96 fourtrak F78. All has been ok for a while but yesterday a funny noise started from the front of the truck. I thought it might be a loose screw causing the sump guard to rattle off the towing eyelet or something like that, but after further investigation narrowed it down to when i'm driving in 3rd gear and taking my foot off the gas. It's a chattering metallic noise like metal vibrating against metal and really quite loud (i know it's hard to try and explain what the noise is like without actually hearing it), and only occurs in 3rd gear.
My mate, who's a mechanic but knows nothing about Daihatsu's, had a drive and rekons 3rd gear is knackered and advised me to drain gearbox and see if there are any bits in the oil. Other than that I'm not sure what to do and am scared this might be an expensive problem to sort. I need my truck to get to work but am a bit worried the whole gearbox might pack in when i'm driving...:help:...i drove home today but never used 3rd gear, will it harm my truck by doing this? I'm ok at doing basic mechanics but this is beyond my capabilities i think...can anyone help please?