Yeah, they ain't for high speed cruising man.

 

I had a bit of vibration at speed until I fixed my saggy crap suspension--now it is as smooth as butter.

 

Agreed, but I have had mine to 115MPH on a straight stretch of highway, going downhill, and it was smooth as silk. I was probably getting no better than 5 miles per gallon the 15-20 seconds I was going that fast though.

Generally driveline phasing refers to the angles of departure from the transmission/transfer case, and the angles of approach to the third member. Trying to remember what I've read about different orders of vibration, I am thinking your vibration is more than likely going to be a wheel balance issue, rather than a drive shaft problem.

 

lol.............

 

It depends, only a little and you can barely tell, a lot and it rattles your teeth.

Phasing is the relation of the yokes to each other as shown here:
D1 propshaft is phased


DII is not

 

I know they are not phased but is it possible when you put the pieces together can some of the bits be turned 180 degrees compared to how they were installed originally or is there only one way to put it all back together?

 

Yes. Both flange yokes and the center yoke can be installed 180 degrees from original. That's why you mark their position relative to each other before taking them apart.
It won't hurt anything if they are installed 180 from how they were, but odds are good you'll need the propshaft balanced.

 

If you are under there it should be pretty easy to see where it was installed by where the corrosion and dirt is and is not.

 

Thanks for all of the posts. Well, maybe not quite all. While the front shaft is out I flipped the CDL 'nipple' and drove it with the rear shaft only. I am still getting a vibration at low speeds but not quite as bad. I an guessing that I am going to need a new rotoflex and u-joint for the rear shaft. I did inspect the rotoflex and found cracks in places, I am assuming it is time to replace.