Loud noise when switching to 4 wheel drive.

Asked by Jan 23, 2019 at 01:44 PM about the 2008 Ford F-350 Super Duty FX4 Super Cab LB

Question type: General

When I switch the knob to 4 wheel drive,  there's a
loud beam from underneath the center of the truck.  
But it does lock into 4 wheel drive.

2 Answers

234,935

My Ford make a thunk when engaging, especially into 4Low.

185,325

Could be tansfercase chain slap and that means it’s time for some transfercase work, left unchecked it could break the case. I never put my 4X4 in unless the rig is standing still and on as level of ground as possible with the tranny in neutral and the park brake set. I don’t subscribe to the “shift on the fly” idea.

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