hi, i've had my blazer for roughly 3 years now and have had this problem with the 4x4 for about the last 2 months. ok, problem is all the lights are coming on on the 4x4 switches (including the service 4x4 light by the dash/gauges) causing the chev to drive jumping in and out of 2-lo to 4-lo to 4-hi. this is the first time in all my time i've had it that this has happened. i've taken it to mechanics and they can't find any problems, they've put it on the dino which has read nothing and haven't been able to help.

if anyone has any suggestions to this problem it'd be much appreciated. thanks.

 

How many buttons do you have on the dash for the transfer case? Have you checked/cleaned the connections at the dash switch, TCCM, and encoder motor?