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How to synchronize the 4WD

(1999 Chevrolet Silverado 1500)
in Balsam Lake, WI on January 05, 2014
1999 Chevy Silverado 1500...I replaced the dash buttons and front axle actuator. Problem is that when button in 2WD the front drive shaft turns but not axles or tires. When button in 4WD the front shaft will not turn. When I manually turn front tires the axle turns also but not shaft. ( seems like things are switched around ) . I tried to get it to flip flop again but not much luck.
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Popular Answer
of G. T. Service Center on January 05, 2014
The Transfer Case Control Module needs to be scanned to find the fault for this.
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on January 05, 2014
get a code U1026 and I think U1049 (lost notes)
communication loss
can I trick the switch somehow unconnected
of G. T. Service Center on January 05, 2014
No tricks to the computer controlled circuits. The module communication circuits needs to be found and repaired. Could be between the case module and encoder, I have seen broken wires between them before in the harness from debris of 4 wheeling. The best and ideal way is to use a Tech2 scan tool and test the system and determine where to start.
on January 05, 2014
what if key was on when I changed buttons
of G. T. Service Center on January 05, 2014
It could have spiked the control module.
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