4x4 being weird

[nrlemons]

ive seached the forums and most of the stuff ive seen was about vacuum lines and stuff. i have a 98 blazer LT 4x4 with the electric transfer case and whenever i push the 4 hi or 4 lo from 2hi it flashes for a while then just stays on 2hi, i can hear what i think is the tccm clicking, i can hear no noise coming from around the transfer case during all this, all the fuses are good. is there a connection somewhere i can check. i dont think it would be a vacuum line because when it does work, the motor doesnt need to be running for it to engage any help?

[Tangent]

Somebody correct me if I'm wrong please.

To shift from 2Hi to 4Hi you need to be moving. Then to shift from 4Hi to 4Lo you need to be stopped.

[nrlemons]

2hi to 4hi any speed, any hi to 4 lo you need to be in neutral either stopped or moving 3-5 mph, so says the manual

[toadma]

it sounds like your encoder motor or sometimes called electric shift motor went bad.mine did the same thing.if you can,find one from a junk yard or used car parts place.i know that a brand new one runs about $500.