I hate to be a nag, but I'll do it anyway. A lift by itself may improve your approach and departure angles, but it will not give you any more ground clearance unless you run taller tires. If you leave the current size tires, your pumpkins are just as close to the ground as they were before the lift, and they will still drag in the silt or on two-tracks.
Agreed - I was doing the lift to not only fit the bigger tires - which not only smooth out the smaller stuff, but as you mention, give the differentials a bit more clearance. But, there are additional benefits to a suspension lift with a longer wheelbase vehicle - namely breakover angle with my longer frame rails. Also, I have had to back down from a trail due to a water crossing that was just a tad to high for my comfort level with the stock height of my truck - I do have carpet and electric seats...............
We are preparing for Mojave Road in November and there is water on that so I want to make sure I can do it - unless it is swollen - then I know better.
I took Ducky's Dad's advice to my rig today. Saws, BFH, grinders, etc - now I can fit 35" tires no problem - without HAVING to lift it. I'll get the tires and differential work done - then decide if I want to lift it and if so, by how much.
Also did a really cool mod to the rear bumper. I'll post up on that tomorrow in my Avalanche build thread.
THANK YOU FOR ALL OF THE INPUT. I do consider ALL of it while weighing my options and determining my best path forward.