The difference is with the bars that connect above and below the axle, they have a shackle at the frame mount. Therefore they flex better with the suspension but still stop axle wrap. And you also don't have to worry about following the arc of the spring. You can pretty much have them as long or short as you want. The single bar is more rigid and limits the flex a little more if you don't do the geometry. For the single bar I normally use urathane bushings that give, as where a hyme joint doesn't. But on the Dodge, since it's just a sled puller, it's max suspension travel is 1" due to stops, we wanted it to be very rigid. Plus the hyme's allowed us to crank on the bars and really preload the rear axle. So when he hooks and it squats that 1", everything is very solid, much like not having suspension at all. And all the power hit's the dirt. Does that make sense? LOL

 

Yeah mostly makes sense.
So you say your single bar is better? I have been looking into this but for a trailer puller/daily driver situation. I would imagine urethane bushings would be best for that situation.
How about axle travel? It shouldn't be limited should it? Every now and then I will ride a trail but that shouldn't be a problem either, huh?

Basicaly I need it for pulling and that occasional burnout but still need drivability.

 

It's about broad as it is long. I pull pretty heavy with mine and don't have a problem. But honestly the triangle bar is the best all around setup, that way nothing is in a bind if the math is wrong. But if you look at your slip joint in the driveshaft, you'll see it only moves in and out about 1/8 of an inch on a stock height truck. The bushings will more than take that up with flex.

 

I was just trying to prevent the axle wrap mostly. Plus they look kool.