You can do a coil over conversion on a Ranger. I've seen them done on lift and lowered TTB/TIB, torsion bar and SLA Rangers. QA1 makes coil overs that have a fairly short 4-6" stroke to them. Otherwise the shortest offroad ones are 8" travel.
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1995 Ranger XLT 4.0L/TH700-R4/4.3 Atlas II
D44HP/D60FF, 4.88s, ARBs