Driveshaft worries

[champions53]

I bought my 86 with the trans blown and just installed another an have been driving it for maybe 3 days so far. My question is when I took out the driveshaft I noticed it as a pain in the arse to get out no room for it to slide up in the tranny. When I installed another trans same deal pain in the rump to reinstall to the point where I had to take the caps off the u joint an rotate yoke to get it in then reinstall the caps. Ive had a SBC in a s10 that had this problem but when you hit a bump you could tell there was a big problem with it hitting the trans. This truck seems fine when I drive it. Combo is 350/ 350 long shaft. Short bed truck. Any ideas?