if I have an on the floor shift for 4wd does this mean theres no shift motor for the T.C. ???? would a bad vac soleniod cause the 4wd not to engage? could it be a stuck IWE,stuck open? ,a stuck check ball? 4hi light comes on but no 4wd no grinding or noises just stopped working ! its suppose to snow 8-10 and i have no 4wd HELP!!!!! forgot to mention i have 1 new iwe in the drivers side and already did the vac solenoid on the firewall,could that selnoid have gona bad? or could the passenger side be stuck open thus putting all the power to the wheel thats not engageing? and creating a feel that there is no 4wd but only i front wheel is spinning? thanks for anyone that helps!