If ride height is lower than spec at any wheel position, count the number of the 1/4" inch shims in front of and behind that wheel position. Removing one shim from in front of and behind a wheel position RAISES that wheel position 1/4". So, if 1" low, remove 4 shims.
How to check:
https://groups.yahoo.com/neo/groups/Safarifriends/files/Torsilastic%20Ride%20Height/If ride height is significantly out of spec, it will ride poorly, wear suspension components and if in the rear, is really hard on the U joints.