Landy owner: Hey guys. On my series 3 Is my universal joint on the prop shaft meant to be spinning in 2 wheel drive? it’s making a clunking noise when it engages and starts spinning.
Should it only spin in 4 wheel drive ?
Intelligent Tinkering: You must mean the forward drive shaft, right? Because of course the rear one spins in 2WD. Push down the yellow knob with the red lever already in the forward position and you go from 2hi to 4hi. Pull the red lever back and you have 4lo. Assuming your wheel hubs are locked. Your transfer case is supposed to disengage the front shaft when the red lever is pushed first back all the way then forward (from 4Lo to 2Hi). The yellow knob should pop back up. But if the transfer case hangs up or the yellow knob and red lever are not worked, or working, properly, you might still be in 4hi or lo. Make sure the yellow knob pops back up more or less smoothly when you work the knob and lever in the right order. It's possible to get the knob bound up by incorrect assembly of the floor plates and guide, so if it sticks disassemble the RH floor and tunnel and try again. You can also lose transfer case oil and get it bound up that way. The transfer case has a separate oil filler plug from the gearbox. It's on the case to the left of the emergency brake drum. You may want to take this out, stick your pinky in, and see if there is anything in there. This is easy to do with the floor out. Finally, if your wheels are locked the shaft will spin all the time too. If all of this checks out and is not the cause, it may be time for a transmission/transfer case refresh or rebuild. I always get new floor plate fasteners as needed when I have the plates out for any reason. It's better than having to cut heads off bolts. I'm not a keen originalist so I just use hardware store galvanized stuff, because my Landy has to work for a living.
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