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I have a 04 with 100tho miles.the 4x4 was not engaging.i replaced the front actuator still nothing I can hear the encoder motor working but no 4x4.i found the ground under the driver's door was oxidized cut out bad regrounded.now when I engage the 4x4 in low I hear the clunk never heard it before but still no 4x4.what else is there to look for.ty for all the help
 

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2004 gmc envoy_slt
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When you switch from 2HI to 4HI, does the Service 4WD light on the dash come on? If not, then the system is doing the correct things, except the front disconnect is probably not engaging. This is a common problem due to lack of lubrication or a broken fork in the dosconnect.
 
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