i have a 94 chevy s10 4.3L vortec, i dont have 4wd, it is push button 4wd, when i push either 4 low or 4 high it engages ( click from transfer case) but no front wheel spin, only 2wd, when i in 4 low i have 2 low, nothing to the front wheels, no grinding or nothing, i used it yesterday in the back yard and it was fine, went to use it today and nothing but the light lit up and the click into 4wd, anyone know my problem, need help asap thanks