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thanks guys

When I put it 4 wheel drive all the vents shut off and switch to the defrost and when I switch back to 2 wheel the defrost shuts off and goes back to the vents again. :shrug: Also the 4wheel drive doesn't lock in either!:cursing:

Hello everyone my name is Erik. I am from south central Pennsylvania I've lived here all my life. I just recently bought 2004 F350 lariat dually and I am new to the diesel world. My truck is all stock that I know of. The only things I have done to it so far is remove the company lettering that...