Hi I waswondering why on my 93 ranger 4x4 to put it in 4 wheel drive it works the best if it in 1 gear moving about 15 mph when you push the 4x4 button.When i try to put in 4x4 when standing still it will not go in to 4x4.Is there any reason that happens.Its a 93 5 speed with 4x4 push button with auto hubs.PLus i need oil in my tranfer case its a borg-warner1354 is ok to put dexron 111 /mercon automatic transmission fluid in my transfer case.thank you