Bad shimmy, almost tank slapper

2005 goldwingmotortrike 2+2

straight axle

ladderbars

Improved driveshaft

The other day I went for a long ride. On the way home I got the bike up to about 60

no issue, as soon as I hit 65, there was a rear end shimmy.

Real bad side to side shimmy.accelerated through it and at 70 it stopped.decelerated back to 60 gone, accelerated back through 65 shimmy.pulled drive shaft. intact, no binding not missing or lost caps no, play at all.shaft was fully greasedchecked heim joint on top of pumpkin (which was the cause last time it wobbled) no play in it

all other heims no play in them.the only thing I can imagine, and I hate to even think this is a cracked frame somewhere.

but I’m praying not.

any advice.?
 
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