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Old 06-25-2012, 09:26 AM   #1
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What is this knob?

I picked up my first Jeep which needs work.

Can anyone tell me if the knob in the picture is a vacuum knob for a locker for the front axle? If so how does it work?

I know if I push in the red button I can pull/push the knob to engage/disengage something. It also turns but I don't know if turning it does anything.

I ask because the front axle U joints are clanking. When I push in the red button and pull the knob out the clanking stops. However with it pulled out, when I turn the steering hard right or left the front end sounds like it's going to snap off and I can barely move the jeep.

Thanks,
Chris
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Old 06-25-2012, 09:28 AM   #2
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Here's another pic that may be better...
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Old 06-25-2012, 10:04 AM   #3
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It looks like the Posi Lock cable system for the front axle CAD system (Center Axle Disconnect). When you push the button and pull the cable it locks the passanger side 2 piece axle together and when you push the button and push in the cable it un-locks it.

The Posi Lock system replaces the vacume system that came stock on your Jeep. As far as your clanking it sounds like you have broken u-joints and when you pull the cable and put power to the front axle in 4WD the u-joint is binding up.

Let us know what you find.
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Old 06-25-2012, 10:04 AM   #4
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It would be my guess that it is a cable for the front lockers. Try to see where it goes.
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Old 06-25-2012, 10:23 AM   #5
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Hand throttle maybe?
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Old 06-25-2012, 10:33 AM   #6
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Posi lock for the front end
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Old 06-27-2012, 10:04 AM   #7
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Thanks for the responses everyone! I will be working on the front end this weekend and let you know how everything works out.

While I have everything apart I'm going to do new ball joints and tie-rod ends while I'm at it.

Never done front-end work like this before. Should be fun!!!

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