i bought a 88 all-trac with the servo for the awd lying in the back seat. the previous owner had taken it off as one of the vac fittings had broken. i repaired the broken fitting but am at a loss as to the proper hookup of the vac hoses. there should be 4 but i can only find the three coming from the elec/vac switch on the firewall.i have looked at the haynes ans chiltons manual and yhey don't show much on the all-tracs, and my local toyota dealer is less than accomadating when it comes to info on all of my old stuff. if anyone knows or knows of a site where i can view this it would be helpfull. thanks