For the Service 4WD I have read it could be the encoder motor for the transfer case or the switch. I would do an Internet search on it, possibly the Z71 Tahoe/Suburban forum, for more info. Seems like most threads on here go unanswered. Hope this helps.
Hello everyone. Wife and I just bought a 2005 Tahoe Z71 4x4 w/77,000 miles. One owner and it is immaculate! We are loving it, loads of room for us and our daughter/carseat. We also own a 96 Suburban, currently down with the common 4L60E "no Overdrive". The 5.3L has pretty decent power also...
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