When you are working on your driveshaft be sure to take in consideration the suspension at full droop in the rear to make sure the yokes dont' bind. My nephew has been running this shaft for several yrs with no problems. Obviously its not in a 40.
In my experience, @White Stripe is correct. I learned a long time ago, tops and trail riding don't go well together. When I was building my 40, there was not going to be a full top. I would run a bikini top and maybe soft doors, and I rarely if ever take doors with me, unless the weather is...