Outer Limits 4x4 Board

89 gq won't engage 4wd. i can shift down to high4 and low4 but nothing happens the green light on the dash doesnt come on and it wont engage 4wd. the hubs r locked in all the linkages from the stick to the transfer look to be attached and working properly. how can i fix this ???

Hey bud maybe take your drive shafts off select low 4 in the transfer and see if both shafts turn turning them by hand u may have a selection problem I got a second hand gearbox once and put it in and thats what was broken in it 2 broken shift forks
And on another note u havnt receantly fitted a body lift coz ya gotta cut the floor or bend the stick yo select 4wd

i found the problem the linkage was slipping around the shaft going into the transfer case i put a new pin in it and its good to go. thanks for the help