Another thought for you if the above doesnt work..... If it is a NP 203 case, the shift linkage comes loose an makes it a PITA to shift or get into/out of a gear. You might crawl underneath and check to see that the linkage is properly adjusted/tightened and is on the case correctly....
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The Devil
1983 ONE TON 454/400/208 11" of lift on 44's
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