Won't shift into 4HI, grinds when shifting into 2HI from 4LO

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Chris6060

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I have a '94 Z71 ex. cab 1/2 ton automatic.

When I shift the 4x4 into 4HI, the light never comes on saying it's in 4WD and it never does engage. 4LO Engages fast and easy. If I shift it back into 2WD from 4LO there's a loud grinding noise regardless of if the truck is in P, R, N or D.

Any ideas what would be causing these issues?
 

Chris6060

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Still looking for help on this.

Would like to know how to disconnect the linkage so I can screw around with it. Still no 4HI, and winters coming quick. Really don't have the money to shell out for a transfer case.

Thanks guys.
 

Sketch

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Sounds like the chain is stretched or broken. Another possability is the lock ring. it can break allowing the shaft to move freely
 

Chris6060

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I've gotten it to shift into 4Hi once.

I was in 4Lo and then pulled the lever straight back to 4Hi and the light shut off then came back on and I was in 4WD, did a couple sharp turns to make sure.

But I haven't been able to replicate it and its really frustrating me, 'cause winter is coming quick here
 
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