87 GMC Crew Cab 2wd to 4wd

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I have an 87 GMC 1ton crew cab, 2wd with 454 / sm465. Original plan was to lower it but my wife traded in her SUV for a Dodge Charger and we need a 4x4 available living in CO. She also wants me to swap to an automatic so its easier for her to drive. I'm a little upset about changing up my project...but anytime your wife gives you a green light to mod your truck you better jump on it! haha

So, I have a Dana 44 out of a 74 3/4 ton with disc brakes and 8 lug, 4:10 gears (matches the rear axle in my truck). I think the Dana 44 will be fine because it will only be used for driving in the snow if necessary... no serious 4 wheeling.

My question is, will this bolt up fairly simple to the 2wd frame? Drill new holes for hanger/shackle and adjust steering linkage? Relocate spring perches? I assumed the biggest pain would be removing the k member from the 2wd set up.

Also I have a th400 with transfer case... so just need to move the cross member back? Get new or modify front and rear drive shafts? stand alone tranny cooler? after market floor shifter?

Any advice or information is appreciated! Thanks!