Leaf springs & CalTracs separation

[Brad Hawk]

I'm interested in people's feedback on how they've set up their leaf spring suspension when using CalTracs, Assassin Bars, etc. w/ respect to promoting vs restricting chassis separation.

My original understanding was using these "devices" allowed for more control of the rear suspension on launch w/o having to rely on a large amount of chassis separation as was expected (required?) w/ Super Stock springs, Try-City Launchers, "slapper" bars.

However, I'm seeing plenty of Stockers w/ CalTracs & Assasins where there still appears to be significant amount of separation happening. I'm wondering if it's an "it depends..." thing, whether certain chassis combinations (like my Mopar E-body) respond better to this approach, or what other factors may need to be taken into account (leaf spring lengths before & after axle? weight distribution? ...?).

For reference, here is the data from a series of passes made before I pulled apart the car (quite a ways back, unfortunately). The CalTracs & split mono-leaf springs were strapped down a good bit w/ the old Ranchos on setting 4 of 5, so there was minimal separation. The front suspension was very loose (possibly too loose) w/ 5-1/4" extension from static ride height. Unfortunately, no good pics or videos to go w/ the data.

Also, in case the 60-fts look "slow", it's cuz this is a street/strip car w/ only a 4500-flash converter, 4.10s, and 9" DOT drag radials. Welcome to my build of compromises...

- 60 - / 660 / MPH / 1320 / MPH / Weather conditions
1.459 / 6.682 / 101.66 / 10.566 / 126.01 / < No weather #s >
1.468 / 6.677 / 101.87 / 10.561 / 126.00 / 74*, 48%, 30.57"
1.463 / 6.698 / 101.45 / 10.582 / 126.18 / 65*, 42%, 30.38"
1.464 / 6.682 / 101.71 / 10.563 / 126.12 / 72*, 33%, 30.35"
1.459 / 6.681 / 101.47 / 10.570 / 125.97 / 73*, 33*, 30.33"

Not asking for "trade secrets", but some feedback would be appreciated. Thx!