About 15ys ago i was faced with boot issues on the slip shaft. After reading a reference to a 4X4 shock boot being used by somebody, and looking at a picture of the whole shaft in a Caspro catalog, I went to NAPA where I opened every box that had a shock boot and found one that fit almost perfect. The brand name is "Strut Mate". NAPA part # 63975 for $15.95. It covers the CV joint clear down to the zirk on the lower part of the shaft. The upper end was a tight fit and is held in place with the zip tie supplied with the boot. The zip tie however did not work well, so I replaced it with a narrow hose clamp, Lower part was just a little big so I fit the split in the boot around the zirk and put a zip tie on either side of the zirk, keeping it from sliding either up or down, but still leaving the zirk out for greasing. Been using it that way for 15+ years now with no issues. JWID

Where did you get a silicone boot? The boot, upper and lower I put on my
coach turned to dust. Dirtiest job I ever did.

Pay special attention to that instruction to "4. P(B)ut alignment marks on all parts to be moved." The upper CV, with its 6 bolts, has those 5 WRONG ways to go back together, making that reassembly one of the most common ways of getting the steering box out of alignment. And the CV housing is VERY hard -- I had to use a grinding wheel in a Dremel tool to put permanent marks on mine (MANY years ago). I suggest installing a Zerk fitting in the upper half while it's out so it can be kept greased for the next 50 years.

The Blue Shaft, with its 4 possible positions is important too, but easier to keep correct than the CV.

Ken H.

I avoid silicone parts for boots and hoses as poor tear resistance. Almost as much as I avoid urethane arm bushings for harshness.