I show the length of the rod in the thread pics. I am not sure the total length with the u-joint, but you could likely guestimate that pretty good. I leave this adjuster in all the time. It really convenient to adjust if I need to. On long trips with some lousy roads I sometimes lessen damping like 1/4 turn or so, but most of the time I just leave it where it is since I like how I tuned it originally. You could likely leave off the rear deck for initial tuning. Drive it for like a week or two like that and see how you want it set. Then put the rear deck on. Or do the remote adjusters like I did or with the KW ones. Up to you.