4 wheel drive trouble.
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Check your fuses. Then crawl under the truck and unplug the switch at the T-case and fill the connection with Dielectric grease, plug it back in and try again.
Sounds like a blown fuse... Vacumn leak would NOT keep the T-case from engaging, just keep the 4x4 from locking up.
Sounds like a blown fuse... Vacumn leak would NOT keep the T-case from engaging, just keep the 4x4 from locking up.