I have a 98 k1500 the goes into 4wd low only. When I put it in high it goes in easy and lights up but have no power to the front wheels. Any suggestions what it might be? It grinds going into low but does work once its in low. 4wd is on the floor. Any feedback would be helpful!!

 

Link broken, bent fork/linkage, shaft broken...

You need to look and see just what Case you have, then search for a parts breakdown/diagram and see mechanical routes/parts which engage front wheels.

PS:
I just re-read your post, are you saying that you have front drive in lo, but not hi ?
If that's true, you have a linkage problem, not a shaft problem.

 

Thanks for the reply. Yes I have power to the front front wheels in LO range, but not high range. Where would I find the linkage?

 

Given that you do have front drive in Lo, then, the problem and linkage is inside the Case it's self.

Have you gotten under your ride, and found out exactly which Case is being used ? Should be a Tag or stamped Model Numbers on it.

Also, have you decided to rebuild/repair the Case yourself, or, just buy a replacement and install that ? Replacement Cases run from $800/$1000.

Once you identify the Case, then we can lookup an Assembly Diagram and better identify the cause. (likely is linkage, but, possibly a gear is damaged)