I was tipped off to a sticky on the YB forums about cal-trac set up. I've copied and pasted it into word, and edited it so it's easier to read. Do the guys with experience running caltracs on leaf spring cars have anything to add to this?
I don't expect my falcon to have the power to pull any wheelies, or destroy the tires - so it's probably not the best test case for this - but I thought others may benefit from the discussion.
1. FRONT: make sure the front control arm are not binding. this is one of the biggest issues. you can do this with after market bushings or control arms or just elbow grease. the control arms should fall on there own without having to push them down. the front springs need to be of a drag style that will give you the best weight tranfer you can AND MUST HAVE ATLEAST 5" OF UPWARD TRAVEL IN THE FRONT END. shocks should be of a good drag style i like d/a afco's. AFTER DOING ALL THE ABOVE SET THE SHOCKS AT FULL LOOSE FOR THE FIRST FEW RUNS.
2. FOR THE REAR same thing binding is the number 1 issue most the time it's in the shackels and the front leaf spring mounting bolt.. every car i see the bolts are over tightened you should be able to push the rear down 5-6" easy without the shock or caltrac mounted. lube all bushings well and don't over tighten. know that there’s no binding, any adjustment later will work..
3. i always start in the upper hole and preload of 1/16 gap. this will give you a lot of pressure over the rear tire. shock settings ON REAR, i always start at full tight on extension... know that the car is setup for a test pass have someone video it.. THE CAR WILL DO ONLY A few THINGS NOW.
a. IT WILL HOOK AND PULL A HUGE WHEELIE
- IF IT HOOKS AND PULLS A HUGE WHEELIE THEN TIGHTEN THE FRONT SHOCKS THIS SHOULD BE THE ONLY REASON TO TIGHTEN THE FRONT SHOCK
b. IT WILL HOOK AND DO WHAT YOU NEED
c. IT WILL HOOK AND pull left or right
- IF IT HOOKS AND PULLS TO THE RIGHT OR LEFT THEN PUT A LITTLE PRELOAD ON THE SIDE IT PULLS TO.
d. IT WILL HOOK AND SPIN 20FT OUT
- IF IT HOOKS AND SPINS 20FT OUT START LOOSENING THE EXTENSION ON THE REAR SHOCKS 1-2 CLICKS AT A TIME TO IT HOOKS AND STAYS ON THE REAR TIRE.
e. IT WILL KILL THE REAR TIRE BY HITTING IT WAY TO HARD
- IF IT KILLS THE REAR TIRE YOU NEED TO PUT THE BARS IN THE LOWER HOLE AND ADJUST THE SAME AS YOU WOULD IN THE UPPER HOLE.