Rear suspension travel

MD68 said

New springs, just the kids, no Dukes of Hazard stuff here! I'm just trying to keep my 325/50-15's moving straight up and down to avoid any inner wheel well rubbing. I need to make sure there is enough room for the ANTI ROLL BAR linkage to move freely up and down.

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If you want to fully limit that side to side movement, you're gonna need to go with a 4 link with a panhard or watts link. Or even a triangulated one. Other wise, you're gonna have that side to side play. and anti-roll bar aka sway bar, is not going to help with that very much if any.