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I also replaced my 2 upper 4 links bars with QA1 adjustable 4 link bars from a early 90s Mustang suspension. They allow for a magnitude of pinion angle adjustment!
You cannot use stock lower QA1 lower 4 link bars as CR built the bars to a shorter custom length from a Fox Body Mustang lower 4 bar link length.
I just replaced the lower bushings with Energy Suspension (3.2106) and then welded some additonal 3/16" CRS to the top and bottom of the CR1 bars for additional rigidity.
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