So what does this peace do below just the rod end? Is this made to allow correct movement of the rear end and rear suspension travel Vs a fixed rod end? Can someone explain why some crossmember mounted torque arms are like this?


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as the rear suspension moves, the axle move slightly forwqard and back, all torque arms stock and aftermarket, have some kind of provision for this movement.

 

It just allows the system to "stretch" a bit, forward and backward, to handle the suspension movement.

 

never thought of it befor but you know the link setup like this would cause the pinion angle of the axle to change to unknown amounts. only rear benifit is it would let the rear squat with little to no bind

 

Good point! hmmmmm i really don't think it would change the pinion angle by even a degree or two though the bar would most likely bottom out before it would see a change in agile. but i could be wrong? i mean the bar stays in place if its not mounted up towards the front and you can move it up and down but there's hardly any back and forth play if any at all like this crossmemeber mount is showing maybe under huge accretion and extreme braking? Does anyone really know how much it moves or even a stock torque arm?

 

The sliding link is there, because as the LCA's move through their arc, it is a diffrent arc than the torque arm. If you didn't have this, it would bind up. There isn't lot of movement. With a 20" LCA, with 4" of wheel travel, the for/aft change is only about 0.4". that is going to ammount to a very negligable change in pinion angle at the rear axle. You get a LOT more pinion change, do the the pivot of the torque arm. The sliding link doesn't ammount to much at all. Where as 4" of travel at the axle, with a 70" torque arm (don't recall the lenght of ours off hand), you would get about 3.3* of pinion angle change through that 4" of motion. So the very slight change at the sliding link is almost nothing when compared to the changes you get from just pinion angle changes of torque arm itself.

 

thats exactly what i was gonna say very true though

 

and if it's solid mounted with just the rod end (like some drag specific arms i'd assume) then the drivetrain vibrations on a typical street car (like 90% of people who buy these arems) would be so teeth rattling it'd be unbarable