I've never had a Trunnion driveshaft rebuilt admittedly; but your description sure reminds me of an inboard C/V joint.68RT said:You should be able to slide the boot over the pin after removing the balls. DO NOT LOSE THE NEEDLES. As you slide the balls off, push some grease into the needles before they get off of the pin to help hold them in place. It will save you a lot of time.