For what it's worth, a 3.27 with a 26" tire still isn't as bad as a 3.90 with a 28.68" tire. You would have to run a 3.55 gear to equal it when factored for tire height.
I bet you would be fine with the 3.27 gear, but I would guess a 3.08 would be better.
That crossed my mind too.. I've been wanting new gears anyway. These have a slight howl to them when either on the gas or off. Typical Yukon gear, it seems. After talking with a few Ford guys, FoMoCo is the better gear for the 8.8.