1985 300TDT 0 120K plus miles. Speedo not working, Have disconnected the cable at speedo back and went for a drive, cable end does not turn, but it seems that it can slide out of the flex "conduit", is it supposed to be able to do this? The speedo does work, - turned the shaft in the back and the needle moved. Also - how easy is it to replace at transmission? Is it connected at the TOP of the trans, halfway up ? Single screw holding the end in place? Thanks in advance.