You also need to make sure to disconnect the gas tank filler hose/neck from the body. There are four screws on the filler bezel, just undo them and then reattach after the BL is installed.
My body lift caused me to not be able to engage 4 low, even after adjusting the stock linkage. I may be completely wrong, but I think with a 1" BL, there is enough adjustment in the stock linkage to not cause any problems. The extra .25" on the Savvy may (or may not) make the small difference, as I was able to get the shifter almost into 4 low, but it would pop out.
The easy solution is a Savvy cable shifter.