Then thats not U-joints - sounds like it may be coming in/out
of gear perhaps? Have you checked shifter cables etc ?
Also, might be that interupter switch thing that cuts out the
iginition when you go in/out of gear, and cross over to reverse.
Is this an Alpha drive? Or god forbid a Cobra drive ?

Mine is a cobra -- whack me with the bad news while the boat is out... G

I think I have an electrical (new boat to me) as the cut out is kicking in when
I hit the trim. It also will let me trim it into trailer mode while underway --
I know; off topic thread.....

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