I have a 99 GMC Yukon denali.. 4wd kicks out on 1999 GMC Yukon Denali

When I engage the 4wd the light flashes and it sounds like it engages but it isn't engaged or it kicks right back out. I fix my own vehicles but have never encountered this problem before and can't seem to find any info on line about the problem. Also i dont know if this would make a differense but it has a lift kit on it... Some body some suspension not sure how much of each but I know its 11 inches total! I know everything worked about a year ago and nothing has changed since... One day it quit working and has been doing this ever since!

by in White Cloud, MI on April 17, 2013
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1 answer
ANSWER by , April 17, 2013
poss. issue with fork shifter.