I am trying to measure my driveshaft to get it shortened. Never done it.. I noticed these ball & trunnion u-joints have some spring loaded give to them. Do I measure from the mounting surfaces of each u-joint, end to end. Or do I measure then add a bit for compressing the u-joints into place fore and aft. How much to add?
If I need to replace the u-joints sometime down the road I guess the new u-joints will be the same length?