Just ordered the Eibach pro truck kit.
Anyone know what Airlift size works with the rear springs?
I don't have a definitive, I've-already-tried-it, answer for you, but here's what I've learned.
Some recommendations and thoughts are below, but ultimately, I think the best thing to do is get your kit installed, let it bake for a month or so, take some measurements (check the build-a-kit wizard I reference below) and call Airlift and ask what's best.
That said...
The stock rear suspension takes Airlift 1000 Part # 60804 (bags with dimensions of Ø4.90" x 8"). The Eibach Pro Truck yields 1" of additional lift (according to their web site). So you'd want an Airlift kit with 1" longer bags (with the same diameter). That'd be kit # 60920. This is the logic I used for the bags on my lifted Honda Pilot (yes, I lifted a Pilot), and it has been stellar for almost five years.
You can get more details at Air Lift's build-a-kit wizard
here.
Since we're here, I'll also share what I learned about the kit needed for the Eibach Load-leveling System (LLS) rear suspension. According to the tech guy I spoke to at Air Lift, and based on my spring dimensions (Ø3.25" x 7" [using Eibach +100 lbs springs, #1200.375.0225S, yielding ~1.5" of additional lift, pending on the phase of the moon]), I'd want #60724. (Which is actually for a Ford Focus wagon (!), but it has the right bag size for my application.)
My 60724 kit and compressor arrive Tuesday. I can't start a new thread, so if anyone wants, I'll post the results back here (apologies in advance for watering down this Eibach thread with Air Lift stuff).
Good luck.