I replaced the front pads and the rear shoes on my '95 2500 when I first got it about 2 years ago. If you need to change the pumpkin oil, now is the time to do that too. If you don't change it, you WILL need to add some, as some oil generally leaks out when you pull the axles.
You'll need a 2--9/16 inch socket to remove what they call the "adjustment nut". The big sockets are easily available at auto parts stores--I think mine cost about $8. Also, you might get some new "nut locks" from the dealer too. I used my old ones, but you have to remove them very carefully not to damage them.
You'll also need 2 new axle shaft seals--go to Napa or Mopar for those.
Once you've got everything, and have a few hours to play, break the lug nuts loose, jack both rear wheels up and put blocks under her and get started.
You'll have to remove the flange nuts on the axle and pull the axles--stand them on their flange side and keep them squeaky clean, (I put garbage bags over mine) as you don't want to introduce dust/dirt into the pumpkin when you reinstall them. Then pull the nut locks and the adj. nut and the drum and take the old shoes off. R&R-ing the shoes is pretty standard. There IS a front shoe and a back shoe. Ask the auto parts guy which is which, I believe the short shoe faces the front, but I'm not real sure right now.
Clean the hub and install the new seal in the hub--I tap mine down evenly with a clean flat piece of 2X material, but a press is better if you have one, and then slide the hub/drum onto the brake assy.
Torque the big adjustment nut to 120-140 ft. lbs. , then back it off 1/8 to 1/3 of a turn to provide about 1 to 10 thousandths end play. Push the nut locks in.
My manual says to install new flange gaskets, but I used the old ones--they weren't torn. If you tore yours when you removed the axles you will need new ones. When you slide the axle in, support it carefully and be careful not to damage the seal in the hub. Torque the 8 flange nuts to 90 ft. lbs. Put the wheels on. Adjust the brakes. Add pumpkin oil. Did I miss anything?