I known this is an old thread but I ran into another possible cause for this issue. My right front corner is a 3/4 inch lower than the left after new shocks and a major front end clean and paint. I have been searching and racking my brain to find the solution and I cam across a ford ranger post on using f150 spring perch as a leveling kit on there trucks. They noted that the left perch is 3/8 taller than the right. That was when the bulb went on. I had the perches out to clean and put them in backwards exaggerating a most likely existing lean that I never noticed.
First car purchased in 1997 finally getting some love.
88 ford bronco XLT
5.8l roller, 5.0 HO cam, AFR heads, Edlbrock truck intake, BBK throttle body, Fiveolgy racing MAF conversion, Hooker shorties, KN intake, Procomp 4" stage 2, Deaver leafs, bilstien 5165 front and 5100 rear, tie rod flip, 35/12.50/17