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hi my MU 1991, has manual lock hubs, I can shift to 4 high but the 4 low does not engage and gears stays in neutral, 4x4 light on dash stays on I have no idea what is going on .

manual or auto? How are you checking the 4wd activation?

its a manual, with the shifter, I put the shifter on 4l and there is no drive, but the dash light is on

I put it on neutral, hand brake on, shift to 4l, as I try to put the gas on the car doesn't move

try taking the rubber boot of the 4wd stick it might be stopping the stick from engaging properly

I have made a 2 inch body lift a year ago and fitted a 2 inch extension to the normal stick, but never used the 4wd stick until last week when we had floods everywhere and a lot of mud and debris in the street to navigate. I will do what you said and see how it goes, but there is a strange clicking noise when I drive with the 4wd H as well, thanks

I have removed the rubber booth, and the 4WD gear shifts properly now, but there is still a clicking noise coming from the hub lock when driving !

dont drive on hard surfaces in 4wd. Clicking might be a cv but might also be a free wheel which need taking apart and lubricating

I only use 4wd on dirt or soil, the cvs are ok, guess I need to take the hubs apart and check them out, if there are some damages are there any parts I can replace ? thanks

Biggest issue is dry grease or rust.