So i did the rear differential fluid change and drove around for 5 min or so no warnings came up at all . I got on the truck again and this time the minute i start it the (service 4WD warning was on ) let me also mention that i was also trying to adjust the center console cover and i wonder if the the 4WD buttons could have gone a bit crazy i mention this because i know some other GM vehicles had this warning just because the 4WD controls went bad and all it took was replacing the bottons to clear the warning ....

 

Got the problem figured out ;-) my viper remote start trigers the SERVICE 4WD and yesterday after almost a month of having the truck i tested the remote start for the first time after i did the fluid change ;-)... if i start the truck with the key myself i dont get no warnings so next weekend ill go to a alarm shop that i know to see of they can figure why this is happening .... man that was scary ;-)