Shouldn't a big problem, just keep the door up when you take the assembly apart.
Which spring is it (how far in)? Start from the side closest to the broken spring.
You can get the replacement springs
here
05 RAM 3500 CTD 4x4 Q/C Laramie DRW/NV5600/3.73, B&W Gooseneck, MaxBrake, PacBrake PRXB, Brite Box Fogster, BD steering Box Brace
2014
BoonHauler 3614