I have exactly the same problem . I have adjusted the linkage 20 times and it goes out of adjustment every time . Brand new transmission , brand new neutral safety switch , old linkage . The safety switch may be the problem . (cheap product) If I change the switch I'll get a bath in tranny fluid . This is what I'm going to try before I take a bath : disconnect linkage , place transmission in neutral , place shifter in neutral , reconnect shifter linkage . If you have to move linkage to connect up there is a problem with the linkage which must be modified . This must be done right or bad things can happen . If this doesn't solve the problem it may have a bad switch . Stay safe , Tom
