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get the same year range box as you have truck. if you have a 80 and older get a 80 and older box, if 81 and newer get a 81 and newer box.
the 80 and older have a flare fitting and teh 81 and newer have a oring fiting.
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Actually, the split is '79 and '80 rather than '80 and '81. The '80-on-up boxes are also metric fittings along with the o-ring, too. /forums/images/graemlins/waytogo.gif