TKOPerformance wrote:

Drag race only.  Not recommended for street use.  The idea isn't really side to side stability; its removing resistance from the shackles to allow the body to rise as the tires are slammed into the pavement on the launch. 

I thought their secret to body rise was a floating rear end.... getting the body to rise  instead of squat.
 6s6

I don’t agree that it’s just a drag car mod, and I also disagreed that it would not be effective at eliminating side to side motion. You can push on a shackle side ways and it will flex a little bit, imagine what it’s doing when cornering hard.

Rudi wrote:

This discussed extensively on VMF,  not really a good choice for street driven cars, high maintenance as well as some stability concerns.

I can 100% see were maintenance and Street ability would be a huge concern with this  mod but I can’t see where stability would be affected in anything but a positive way. The application I saw him used for it was for a dirt track.

Raymond_B wrote:

I'd go with CalTracks way before I did that mod. In researching leaf spring "tech" for my Lightning I've learned quite a lot on why the Chrysler guys did/do some of the things they do with their leaf springs. So what works on one of those cars might not work well on a much smaller and lighter Mustang. 

How does calTracks handle it?

A dirt track isn't a street either though.  There's no traction on dirt.  Those cars are modified all kinds of crazy ways to get them to be able to roost through a turn as flat and predictably as possible.  For example, most dirt track cars use a different wheelbase side to side and different sized tires right to left. 

I think the issue you have side to side is that it probably would bind as its side loaded.  This typically results is some scary and dangerous handling on asphalt.  Again, in dirt it wouldn't be an issue because the car, for lack of a better way to put it, doesn't really know its turning. 

A better option would be to just go to Del-A-Lum bushings in the shackles and front eye.  No bind and no deflection.  Pricey though.  A panhard rod or Watts link would work too. 
 

Easy now Rudi, I like to fix problems I don't have all the time

Rudi wrote:

Bearing Bob wrote:

Easy now Rudi, I like to fix problems I don't have all the time

HMMM  . . . . . come to think of it the trip is sometimes more than the destination,
I plead guilty!

That is 100% my situation.  My car doesn't even have leaf springs anymore but I thought it looked like an elegant solution.  Maybe it's better in concept than practice, and very application specific, but it is something that has been available for years so there has to be some value or it would not have stood the test of time.
 

Wonder how much noise that makes?   I know of some really cheapo trailers that forego shackles and just have the springs sliding in a slot.

I like the comfortable ride the rubber bushings provide.  When I first got my 66 in 1992 it had some performance rear shackles with poly bushings. It sounded like there was a bunch of loose chains sitting on top of a bare gas tank that bounced up and down on every bump.
$18 worth of original shackles and it was like a new car!  Same bushings and shackles are still in it.  My leaf springs are working great.