Hey guys,

I have been slowly restoring my '91 300E back to it's original, new condition. I just repainted it (black on Alto Grey from Teal Green! and it's gorgeous), after having paid several thousand dolalrs last year on a variety of improvement projects (new cylinder head, blower motor and blower, tensioner, timing chains, radiator). I also personally replaced my headlamp lenses and the entire grill. Anyway, now that it looks absolutely fantastic, my most recent problem is the transmission. It has been making a loud "clunk" or "single knock" sound every time I decellerate from a speed of 35mph or higher. It always happens as the gears drop down from a higher gear (say, 4th down to 2nd). It's been getting louder lately and happens whether I decellerate slowly or a quick stop. Any idea what this is and how much it will cost to repair?