Yes. I have "Lightning spec" springs from Eaton Detroit. They throw the pinion angle off a little. The guy at ED gave me a part number for a shim that's supposed to correct the angle but I can't find it. The coils will fit as well and are around $35 from Ford. I also had the part numbers but my hard drive crashed (p.o.s Maxtor drives) so I lost them, too.
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