Vibrating or knocking noise when 4 wheel drive is engaged
SOURCE: chevy s10 4 wheel drive will not engage
There is a vaccuum operated switch located on the transfer case that sends vaccum to the accuator that pulls a cable that locks the front end in. Check for vac coming in and out of this switch if no vac out replace it. This switch is a very common problem. You can find them at most parts stores in the help section #49315. please rate.
SOURCE: clicking noise from font driver side wheel 4 wheel drive
There is a vacum powered actuator on the front differential housing on the passenger side. It pushes one way for 2WD and the other way for 4WD. If it gets an erratic vacum signal it can cause the clicking as it goes between 2WD and 4WD. It gets it's vacum from two valves mounted on the firewall just behind the battery(to left). The white line feeds manifold vacum to the valves. Check for vacum at white line with engine running. If no vacum there is a break in line from manifold (not likely in this case). If vacum check the pink and blue lines by applying vacum to each one. The vacum should hold. If not check lines from valves to vacum actuator. If both lines hold vacum check valves. Remove electrical connectors from both valves. Connect a wire from one of the terminals of the valve to ground. Touch a wire from the battery + to the other terminal of the valve. Listen for a clicking sound. If no sound valve is bad. Replace valves(s). Also have someone watch position of actuator shaft as you move the selector between 2WD and 4WD. There should be movement. If there is an intermittent problem sometimes it will and other times it won't.
SOURCE: 4 wheel drive problem on Jeep YJ
you can also check the 4 wheel drive vacuum switch on top of the transfer case...got mine for 10 bucks from parts store...fixed the problem
SOURCE: 1999 Silverado Transfer Case Noise
I have the same problem and its in the front axle..Sounds like its in
the t case but its the front axle.Make sure all your tires are the same
size and same air pressure and the inner front axle seals are not
leaking any fluid..
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589
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