36,37,38 are so easy with just four bolts.39 up looks like more work but never tookout/put back those.Had my 37 out and back a few time and took a 36 ton and a half out to buy the windshield crank for my broken 37.$1.00!! That was cheap even in 1977.Tried to buy the truck but he would not sell and did get on the road as a 1/2 twenty years later with a sealed windshield.36 had some wood behine the dash.My 37 and 38 with same dash had none.