Still shuddering!
 

Still suffering with a shuddering when accelerating hard in second at around 40 mph.If i accelerate slower the problem doesn't arrise.Thought it could be a prop ballencing problem but have changed for a different prop and problem still remaims?This all started after having the box rebuilt last year,gearbox builder reckons the problems not in the box but in the running gear? would greatly appreciate help as slow acceleration and 300 bhp scoob don't mix!

what sort of shuddering is it ie like a misfire or wheel out of balance and does it only do it in 2nd at '''' revs or does it do it in another gear at the same revs

could even be fuel supply problem, if only encountered when under load, but ok at lighter throttle opening.............

It's definately not a misfire or engine problem,it's most prominent at 40mph accelerating hard in second? as you pass 40mph and change in to third it goes away?seems to be worse when accelerating hard round bends?

Any ideas people,still not managed to sort it out?

damaged/bent driveshaft?

could be but wouldn't that make it shudder at all speeds?

anyone?