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78 rebuilt automatic TH 350 and new shift cable . Static engine not running shifter works normal push button to go into reverse pull into neutral and into drive seams to work normal. Now with engine running push button for reverse pull shifter into drive but no drive have to push button to get into drive and it seams like shifter is off one notch. I replaced shifter and still have same issue.
Another member recently had a smilar problem. After removing all the slack where the shifter cable attaches on both ends and where the clip holds the cable housing at the end of the SHIFTER mechanism AND where the cable housing bolts to the side of the trans.... you can do another test.
Drain the fluid/remove the trans. pan and watch the gear selector notched arm INSIDE the trans. as a friend slowly moves the handle thru PRNDL.
Make sure the notched plate is NOT loose on the shaft it bolts onto...if it is, it will cause problems like you have.
Aftermarket shifter kit shown below........
ok stupid me did not realize there is a slight adjustment at the shift lever on a stock th350 at the trans. Made adjustment and all is well thanks for the info.