Old Sluice isn’t about huge travel, it’s about how much body carnage you can stomach. We all need to remember that rocks can be placed strategically if necessary, pride willing.
Before doing a 3 link, if I wanted to do all the huge stuff, I would amor up, have lockers and 40’s or bigger on 5” of lift max and cut the body for tire clearance/up travel, then wheel it to see what is really necessary. But then again, if you want to do the big stuff and you are sure of this, before you take one trip, install tons to handle those big tires and then do your three link with the money that was made from selling the old axles and suspension.
Seriously, if your gonna go big, inmo, messing with the 80 stock axles is asking for trouble down the road.
If you really need a three link, and not just for poser pics, then you need tires larger than 37 which beg for one ton axles. All one needs is the money and the desire to do major body alterations.