My jimmy is stuck in 4 wheel drive on 1990 GMC S15 Jimmy

My jimmy is stuck in 4 wheel drive. How can i fix this problem

Asked by for the 1990 GMC S15 Jimmy
if it is push button 4 wheeel drive dont have an answer, i had a 1987 S10 blazer that had a floor shift and what you need to do is either take the vehicle over some bumpy terrain or check the actuator in the engine compartment on the passenger side next to inner fender annd see if the linkage is all good