soperlogan

Traced it. Two smaller lines on manifold go to the dash air switch. 3/8" air line from top of manifold goes to side port on tractor protection valve. There is also an electrical switch where this line attaches, but the wires have been disconnected.Bottom 3/8" air line from manifold goes to maxis. Switch does nothing, so you are right GNDN. They pulled air from that manifold to the switch at one time to operate whatever when it had a fifth wheel way back.

Thanks for all your interest and help! 

Thanks. Follow it back tomorrow during daylight. Tailgate is separate but similar switch. Mack rears, no deep reduction. 14' dump body. Post tomorrow sfter I trace the lines. Thanks again. 

I have an air toggle switch on our 88 Superliner. Air lines lead to an aluminum block mounted on firewall. Does anyone know the purpose of this switch?

Thank you.

Anyonw know OD ratio of T2060 transmission?