I have 2 Trackers. On the 90, it sat pretty much level stock until I added the heavy bumper/skidplate and winch up front. I added the 1" RRO spacers up front but then it sat slightly nose-up. So I then added the 1" RRO rear spacers as well. This leveled the truck out nicely and I was just running with the front upper strut mount flipped and stock rear shocks.
When I picked up the 93 LSI, It sat nose slightly down stock, kinda slouchy up front. I made my own 1.5" coil spacers and added them to all 4 corners, as well as the strut mount flip and 91 crown vic rear shocks and it sits level now.
When I swapped out the RRO spacers on my 90 for the 1.5" ones I made and added the crown vic shocks, I picked up 1-1/4" of added front height and only 7/8" of added rear height. It sits slightly nose-up again, but I plan on finding some 2" lift coils somewhere to eventually correct this(basically I'm looking for the back end of a Calmini 2" kit minus the shocks).
If your Tracker is slouchy up front, keeping all 4 spacers the same will help level the truck, but if you're level or nose-high now, spacers will only make it more pronounced unless you make the front spacers shorter than the rears. Running 1.5" spacers up front gives you something like 2" of total lift up front due to the fulcrum/lever situation with the IFS....
Adding more droop to the rear is as simple as adding longer rear shocks- to a point. The 91 Crown vic shocks are about 1.5" longer than stock and ride really nice so far(I have them in both rigs). If you go too high on the rear spacers though, you start to bind the center diff pivot on the upper rear wishbone. Calmini's 2" kit doesn't add anything to address this, so I'm assuming a 2" lift is fine without a rear diff pivot spacer, but any higher and you'll want to space it some so it has room to work.
From the pics and explanations of Calmini's 2" lift kit, the rear basically only uses 2" lift springs, longer rear shocks and bump stop extensions. Everything else in the kit is for the front end...
Since the rear shocks are what limits the droop of the rear axle, however longer you make the shocks or move the mounts just adds that much more to the droop of the axle. Just be sure the bump stops hit before the shock bottoms out on compression...
