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if it does not lock in at all, look on top of the crossmember. the vacume line runs on top if it, and it is easy to pull it off. were the lines full of crap? my dyaphram (vacume) was full of crap, so i took a very small drill bit, and just spun it, by hand, to nock the crud out.
 

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One thing you can do is if you pull the CAD unit off the axle, and then with the engine running (vehicle parked, chocked, etc.) swap the vacuum lines that run to the cad. The motor in the CAD should slide the fork to the other side. Swap them back and it should move back.

No need to be in 4hi or 2hi, as the vacuum will always present to keep it in the right position.

if that doesn't work, check for vacuum at one of the lines. Of neither has vacuum, shift into 4hi. If still neither has vacuum, then you need to inspect the hoses back to the t-case, and look for any leaks.

repeat the tests on the output of the vacuum hoses from the t-case. Keep working up the vacuum lines until you find vacuum.

Good luck.
 

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keep following the lines from there up into the engine compartment.

Definitely a vacuum leak or plugged line

The engine was running, right?

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Aaron Wood
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When you say the disconnect of the axle do you mean the vaccum diaphram? That was the cause of my 4wd problem a while ago. I got cleaned out the lines and got a new diaphram, works like a champ!
 
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