Originally Posted by HammerTime
I know the clutch system works because my truck wont start if it is not in. And I would think that the break system works too becuse i still have tail lights but who knows. Ill look and see what i can find. Thanks guys.
Unless you've solved the problem, the brake light switch will solve BOTH your problems. If you go to autozone, advance auto, etc, buy their brake position switch or whatever it is, and install it. It goes on your brake pedal, up under the dash. This switch went out on my 98 2wd, causing me to loose brake lights. My taillights still worked, and turn signals, just not my brake lights. The switch costs less than 10 dollars at an autoparts store.
NOW, you HAVE to have your foot on the brake for the transfer case to shift to 4Lo. Here is the problem with your 4lo: Your brake switch isnt working, and if the brake switch isn't activated, your truck doesnt think your foot is on the brakes, and it prevents it from shifting into 4lo. if your brake switch isn't working, the truck doesnt think your foot is on the brake.
Replace the brake switch and I'm willing to bet that your brakelights AND 4lo work again