RJsfishin wrote: IMO, 30" bar is too short (on such a wide vehicle) to keep the body centered over the rear axle housing thru out it distance of travel. It would be forced to continually move from side to side. The longer the bar, the less side movement there would be.
It IS a track bar aka Panhard Rod. It allows full vertical movement between chassis and axle while limiting side to side movement caused by flex in the springs, spring carriers, shackles, etc. It IS effective for improving tracking, particularly in adverse conditions such as gusty side winds, passing trucks, rut-tracked roads, etc.
As far as 30" being too short-- I disagree. Lets assume you have 4" of vertical travel UP/DOWN from the rest position over bumps.
From the rest position UP or DOWN 4" only moves sideways .26". NOT significant in my opinion (a2 + b2= c2).
Longer is better, but I agree that BlueGrassBill's looks to be plenty long. The aim here is to control uncommanded lateral movement. Sure this design causes the axle point to describe an arc, but as Wolfe said, the effect is negligible. A controlled arc feels and tracks fine.
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