1, Check the clamp on the shift shaft by clutch/brake pedals is tight. 2, Check the two levers on the steering column are parallel with the shift lever in neutral. 3,Adjust the linkage as per the service manual. I had the same problem with my truck after replacing the bolts on the clamp. I had it stick in first 3 miles from home so it was a slow drive home. When I got home I opened the hood and pulled the levers parallel, adjusted and tightened the bolts.
