Chevrolet Tahoe Questions

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Should there be some kind of lock up Even in 2 wheel and can you measure the this If case is in 2 wheel Auto 4 Or locked in 4/4 After having all elect. Parts replaced 2 to 3 times at GM dealer I an going broke but have no 4/4 this is a 2002 Tahoe ( plate on Case in a 2003 truck ) And they tell me there are no codes . P/S Is there a way of getting help from GM FACTOR???
Actuator.control module encoder transfer case rebuilt can hear encoder working there is some movement on front wheels when locked in 4/4 high but will not spin on snow In auto you can turn front wheels by Hanson houst PS all work was done by GM CERT H/d people at a G/m shop Once again ALL ELECT PARTS HAVE BEEN REPLACEED Ithink I need a wiring cart to look for voltage loss NO CODES!!
And it doesn't want to go up a small inclin even if you have the gas peddle pushed down giving it gas what could be the problem can you help me please.
would it be better to change the spider injectors at the same time? if so how much difference is that?
So I have no lights on the switch on the dash, I replaced it with a working switch from a friends Tahoe identical to mine to test it and still nothing. There is no service 4x4 showing on the dash and all fuses are good and still nothing. What could be going wrong?
Alrrady replaced inline filter andfuel pump
Wipers go slow no matter what speed they are set on. The wiper fluid does work
I replaces the batteries in both remote key fobs neither work. The system went out 3 months ago, I try it randomly, it worked once 2 weeks ago but not again. Can I reset it or what should I do.
the back up warning still works but the rear warning camera stopped working. The owners manual gives little advice. How do I reset the camera?
We have had the front end checked twice, and changes the wheel barrening. it still makes the noise
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