Ive got a 240gl station wagon that when you accelerate in 2 3 or sometimes when your starting of in 1 it comes from below. Underneath the gbox moves when lightly levered about 15mm is this muont suss? The tailsharft mount moves up'n'down about 1cm. The problem is only there sometimes. We tested to hear it today we drove about 700m. Up a small hill without any sucksess. But on reaching the botton of the hill stoped. when I stated, as I accelerated in second it banged very loud just like normal. Its so intermitant what could it be??