my light is bliking and it seems that there is no power to the transfer case motor which is new or the front diff actuator which was swapped with a new one. my front drive shaft spins but my tires dont. i can also shift the trans case into 4 lo 4 hi but and it seems to gear down but still no tires spinning i also checked all the fuse that i new of and they were good. so if some one could please help it would be greatly appreciated this thing is drivn me nuts

 

If the T-case is supplying power to the front drive shaft then its a problem with the actuator on the front diff. if you have already replaced it then check the wiring. could be a bent/corroded pin in a connector or a broken. my advice to you is just take it to gm service

 

Take it to a GM dealer, The actuater needs to be programed to the truck.

 

Just had a wire replaced along with connector pins. My Silverado did the same thing.