What happened??

[BIG DADDYS 84]

OK,just completed,rear end swap and drop,1984 step,sb and long tail shaft 350, installed shackles and hangers,removed overload spring,dropped 4and1/2" and if it matters its a 2wd and i installed another 10and1/2 rear end .but it is a 6lug from the same year.installed new center bolts and new u-bolts.heres the problem my drive shaft is now too long.it is jambed into the trans.had to force it in rear yoke.its too long? the other thing is i replaced the rear shocks with new front shocks,read that would work,problem with shocks is they are too short,will not stretch to lower bracket?need some help,thanks in advance,you guys always come through