The switch that changes the vacuum from one side of the operator on the rear axle to the other (low to high range) on Toto has an internal problem I suspect it may be old age related. Some times works, sometimes leaks sometimes doesn't do at all what it should. I did not rebuild or even take this switch apart when I restored Toto. It is part # 676453 in our parts book. there are no internal parts details in the parts book. It is located on the firewall. Does anyone have one that they would be willing to part with or have any of you disassembled one and are familiar with what I may need to fix it. My guess is that the moving part involves leather.
Scott. Check with Joe Zieger. If he still has the parts you may be able to use the switch from a 2R.
You may find it is an easy repair if you pull the switch apart. If I remember right it would be a rotary switch and have little wrong inside. Ted