Iam still running the stock length Rancho 5000's on mine(' 99) with a Daystar BB. (1-3/4)
They are working ok for me. Allthough I dont know if they are limiting my flex.
Thought I heard someone say a while back that Rancho lists the same ones for up to 2".
Get some cheap BPE's like the ones from RRO (rocky road outfitters) for all four shocks. That will give you about an extra inch and that should be "okay" for a bb setup.
The Monroe/Rancho engineers recommend using stock length shocks up to (and including) 3" of lift. If you run longer shocks with a 2" budget boost, you MUST extend your bump stops or you'll bottom out the shocks, and that will kill them in short order.
You're better off staying with the stock shocks and using the money on other toys.