I think he meant "traction bar". If you are thinking of a that, I could see it being kind of funky with Revolvers.
Since a traditional shackle mounted traction bar modifies your leaf spring geometry to essentially mimic a radius-arm suspension design, your anti-squat numbers go very high. This assumes about 6 inches of lift and a traction bar length of about 40 inches (where most peeps with XJ's put them. With the AS above 150%, the rear tends to want to lift under power, separating the Revolvers. It'd be interesting to find if it was any worse than regular shackles, but I suspect it is, given the lack of any resistance to opening.