904 no passing gear/ shifting issue

i just had this happen to me. Was shifting fine and then... not. There is a small E clip that holds the kick down lever shaft up in the proper relationship to the valve piston. in my situation, the E clip had popped off the shaft. it is located just below the throttle lever and above the the gear selector lever outside the transmission. if your throttle lever is at the top of the shaft then there is an opportunity for the the shaft to slide downward (without the E-clip) and then the cam will be below the piston. Something to keep in mind when you pull the pan.