Originally Posted by HighLonesome
Probably around 26.5+" extended length. And then as short a compressed length as you can find. Adjust the bumpstops according the compressed length.
Take your shocks off. Jack one tire up as high as it will go before it rubs. (Trim and use BFH as needed) Set bump stop. Then get the longest shocks that you can fit. You want to have just about the same amount of uptravel on your shock as the space between your bumpstop at ride hidth. At full bump you should have about 1/4" of up travel on your shock.
Fwiw, ive had the expensive shocks (Bilstein & Rancho 9000XL's) and now run the $35 Pro comps (in the front) They have a 5/8" shaft. With 35's I cant tell a difference.
I run the Rancho 9000xl's in the rear. I like the adjustability of them for when its loaded down.