78 were specific to only a couple years if my memory serves me right, I think the 76,77,and 78 were the same, it was a problem on all of those engines. I believe you can bend the shift fork slightly to allow the clutch dog to stay engaged. Again if I remember correctly if you hold the gear shift solid they dont slip but if you let go of the throttle/gear shift it'll kick if out. Goodluck.