I'm thinking it should have had one. You can always add it, just bolts on with 2 bolts and the linkage shaft goes thru it. Just need the correct plug/harness for it.I'm using a '93 4L80 and it didn't have a switch on the shift linkage when I got it. Do you know if it did at one time and was not included in my package purchase deal of - 'pick one out of the corner'?