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Do you also get an ABS light when the 4wd malfunction light comes on?
The rear wheel speed sensors on this truck tend to go out and cause a very similar condition to the one you describe, but it is usually accompanied by an ABS light also.
Have you had the system checked for trouble codes? Toyota lists a number of codes that should be present with a transfer case malfunction.
Here is Toyota's shift inspection procedure. They suggest you do this to make sure the T-case motor isn't just stuck before performing repairs.
I'm sorry. I'm helping another guy with a t-case problem on his toyota also. The info I sent is from Nissan, I just said toyota. Sorry!
Hi, I just wanted to see if you needed any additional information. Also, if I have been of some assistance I would appreciate a positive rating.