OK, another post, assuming I get the head gasket job under control. I replaced the u-joints and center bearing & support a couple of years back. Did this before on a 240 very successfully. Ever since then she passes thru a vibe between like 42 and 48 mph, real annoying. I marked the shaft, etc with paint and know that it's aligned. Had a shop put it on the rack, and we carefully checked all marks and looked at u-joints/support, etc. All seemed well.

I'm thinking a rebuilt/refurbed shaft may be the way to go to get this under control, maybe something is just a bit out with this one or the new u-joints suck perhaps. Anyone ever take this route with success? As always, thanks for the great help.

Mike