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Re: Coil spring rear suspension?
When we started developement of a new rear kit for the 73-87's we originally looked at doing a trailing arm set up like our 63-72 rear kit. We ran into a couple frame framerail / arm clearance issues and the fact that to use an arm set up like that you would need to weld on new axle perches. That is why we went with a parallel with a panhard bar.
The problem with doing a triangulated four link on em is the narrow framerail width. You end up bringing your angled bars down on the rear end housing which is cast. In order to pull it off and get enough angle on the upper bars to be effective, you need to build a foward crosmember, attach the front of the bar towards the center of the truck and then run the bars outward toward the ends of the axle tubes.
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