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I have a 1979 f-250 4×4 regular cab. It's hard to switch the transfer case from hi 4x4, 2x4 and low. The biggest problem i have is when i'm shifting it in 4x4 hi. The front diff get lock. Work fine in 4x4 low and 2x4 hi. I thing is not the differential because in 4x4 low it work just fine. Any idea ?