Replacing the stock shocks in the rear (and removing your swaybar) will allow you to take full advantage of the suspension articulation. If you add the SLR shackles then you have even more articulation potential and retaining the stock shocks will really limit you taking advantage of the additional lift. I believe the Rancho RS9000s have an additional 2" of travel compared to the stock shocks.

I have the Ranchos and the SLRs and I am very pleased with the results!

------------------
2000 White XE 5spd
Member-MAXC