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 firstname.lastname@example.org