4x4 shifting problem
 

hello blazer fans, here is my problem, I Have a 99 jimmy 4.3 with the 4 button 4x4 selector switch. I had a bad encoder on the t case. So I replaced it. Now the 4 hi and 4 lo and auto 4x4 lights will only flash on the dash when the buttons are pushed. I can hear the encoder trying to move but it never actually clicks into 4x4 mode. I can shift the t case with a wrench but it is a little hard. Is there something that could be binding in the t case causing it not to shift. Thanks for any suggestions. Ryan.