put in manual hubs. that is the best way to make sure that they get locked in every time.
put it in 4x4, and it does it for you. or install locking hubs for 50 bucks.
You must first replace them with ones that work.
On your dashboard there is a 4x4 button. push it. The hubs will engage and lock automatically. If you want low range you have to be in 4x4 first then you may push the low range button
Be careful on this. I did it to myself . I install my transmission back on my 89 bronco and found out I didn't lock in the converter right and damage it. Cost me an extra $700 to repair the pump and new converter had the same systems as you.
Turn on the ignition so that your dashboard lights come on but dont start the engine, press the locking button on the keyfob within 10 secs, locks will engage then release. Done.
mine was doing the same now it is doing it with when i shift to drive Probable internal trans failure.
Put it on jack stand. If the four wheel does not engage pull the cord on it and see if you can engage it manualy. If that works the actuater is bad and not pulling the cord.
where may i get a wiering diagram of 1987 bronco11 4 wheel drive touch and go system
I just had mine fixed at the dealer. I was told that water gets into the vacuum lines then into the solenoids that drive the locking mechanism. This ruins the solenoid and it is a very common problem. $600.
A Ford F-150's overdrive will not engage if the torque converter is not locking up or the bands are excessively worn. A full diagnostic at a local transmission shop or dealership is needed to properly diagnose the problem.
Check this one out, for a little humorous take on the standard periodic table.
check the thermostat that runs the fan.