Shaking is erratic, and shakes more as the speed increases. It is not an uncontrollable shake, just annoying and disturbing because it never shook like that before the Borgeson install; just had the "death wobble". Under 60 mph and all is smooth. This is my 2nd Borgeson swap. Curious to know if there was something I overlooked or did wrong. Rubber disk(joint) is still stock and still in great shape. Advice?

 

Could it be that you have a tire shake/shimmy that was being masked by a worn out coupler box? I have had similar problems on the older Mitsu Montero`s I used to work on.

 

The more I stew on it, I am wondering if maybe I did not leave a gap between the splined shaft grom the PS gear box and the end of the Borg Shaft. If I remember right, in the instructions, it mentioned something about leaving a slight gap there. I thought I did, maybe not.
I just had my tires rotated, and the steering wheel shudder was happening before that, also.

 

My guess is that you already had a vibration and the much more solid connection of the Borgeson is transmitting the shake, whereas the worn out original was absorbing it.

 

I have a feeling you may be correct....

 

I had a similar problem. The steering was just sloppy all around. After repairing the stock shaft I could tell something else was wrong. The tierod and drag link were shot, so I replaced them. After all that the tires were starting to cup on the outside and causing death wobble. New everything now and drives great.

 

Turns out initially towards the end of the Borgeson install I took it upon myself to lock down the donut that slides up and down the shaft right up against the U-joint, instead of sliding it upwards towards the rubber weather boot that covers the adjustable section that slides in and out of each other in the Borgeson shaft. The donut is meant to lock down tight against the bottom edge of the rubber boot, as specified in the instructions Don't really understand the reason why but it took all vibrations on the steering wheel away. All is good! Thanks, guys.

 

Glad it was simple to fix.