since you have a straight axle in the rear, will a 2"
spring spacer in the rear only give you 2" at the wheel?
Yes, the rear is a 1:1 lift ratio
I know the crown vic shocks are 1.5" longer,
but are they long enough for a 3" lift?
Yes, unlike the lift spacers at the springs, the
shocks are inboard, which creates a ratio of
the movement, I have 3" rear spring spacers
in the rear, and I run Crown Vic shocks, at full
droop, the spring is just loose enough to move
(rattle) around
You want 2-1/2" front strut extensions to match
your rear, and keep the rear slightly higher