Re: '92 Sport issue with 4th gear overdrive.
Have you checked ignition (distributor)? Could it be a misfire? I had a 92 and recall having some odd misfire issue and the distributor and rotor had a lot of corrosion and simply replacement of those fixed. My truck was a Sport 4x4 with 350 but had the 5 speed (hated that transmission). Bought it new as well. Great truck except for that transmission.
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