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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!

Asked by for the 1999 GMC Yukon Denali
poss. issue with fork shifter.