4x4 partially engages

i have a 93 gmc sierra 5.7 i've replaced the 4x4 actuater with the updated one from GM. it works fine except that when its raining out ,it partially engages.
it sound like a winding and grinding sound, and this is when the the 4x4 shift is still in 2 wheel postion. i can get it to stop grinding by shifting into 4 wheel and then back into 2 wheel . any help please reply hereor to snipped-for-privacy@cox.net thank you
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Hi!
You haven't by any chance snapped this ring too? It happened to me a month ago, and the symptoms you mention are VERY similar. All you have to do to access this locking ring is remove the rear drive shaft and 4 bolts on the transfer case housing.
See
http://www.freuchen.com/Z71/Ring.jpg
Best regards Tord Freuchen, Oslo, Norway.

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