Ok first your not the first to blog this thing It's been talked about many many times before and been resolved You will find the problem is your clutch isn't disengaging, I personally wouldn't of done syncros cause it wouldnt of even been that, people here have done syncros and still crunches It's the clutch, and push rod clutch adjustment, with new gearbox oil does the trick, also new shift cables has worked before I've read somewhere. How much do you have to bend over and pay for that...??