That sounds correct for "about an inch or so."
I have an Xcab with 881s and Bilstein 5100s set on zero.
This rides great. It is roughly a 2-inch lift, which leveled with the rear, which just got lifted 1.5.
Note, however, that I have the 5100s set at zero lift.
5100s were designed specifically to work with leveling (preloading) the stock progressive coils, which are a 375-lb rated spring.
The OMEs are a non-progressive 500-lb spring. You really don't want to preload these for additional lift; it is the spring's height that provides the lift.
So why did I use 5100s? I orignally thought I could just use the Billies to level, but realized I would need to max them out at the top setting, which would make the ride harsher. So I already had them in hand when I figured out I should just get new coils, too. The 5100s are a perfectly good shock in this application and work well set at zero lift with the 881s.
Ideally, you could pair the OME Nitrocharger shocks with the 881s, beacause they are specifically designed for that application. I have no personal experience with that setup as a comparison, but it is popular. However, the Nitrochargers seem to be more expensive than 5100s. And, to further complicate things, front 5100s are increasingly difficult to get because demand is outstripping production.
Back to your truck: the only difference between 880s and 881s is 10 mm of height. You have a 2wd DC...what engine? V6? The weight matters. Also, do you have any bullbar/winch stuff hanging off the front? This is a factor too. Dan at Wheeler's Offroad
has a lot of experience advising folks on this. You may want to PM him or give him a call to discuss.
Good luck. This was totally baffling to me until I did a ton of homework.