Make sure linkage is adjusted properly. Engine off shift thru all gears and make sure they are all engaging. Get car jacked up and have someone watch underneath to see if the gears are engaging again and if possible have a extra person watch the linkage and listen to the engagement. You can feel that on the shifter and hear it too. Linkage adjustment maybe. If not pull tranny and have a good reputable trans guy who knows Muncie and Saginaw 4 speed trans well and go thru it. Good luck.
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