Hey guys I'm along time chevy fan and very frustrated. I have a 2001 blazer and everything was going fine out of no where one day the abs light came on was told both hubs werecbad replaced both all was fine for about 3 weeks. Then out of no where abs light comes back on brake comes on tranny will not shift past drive and speedometer gos crazy one when all lights are on and this randomly happens if i hit a bump all lights go off speedometer works transmission shifts fine. no codes are visible no matter which scan tool you use. Any idias would help i have even gone as far as disconnecting both speed sensor and drove it sadly and confusing instead of having no speedometer it was still doing the same thing. the 2 sensor that i disconected were back end of the transfer case passenger and driver side. beyond confused and frustrated!

 

Assuming its a 4x4?

 

yes it is a 4x4 4 door