55.2-59 57 GMC 550 370 V8 exhaust gaskets

[dsraven]

they say to use the pump in o/d because otherwise the pump turns too slow to operate properly. on some pumper trucks with an auto trans the trans has a lock out switch to keep the trans in high gear so when pumping hard the trans doesn't downshift. not good if something fails and that downshift happens, trust me. the guy on the end of the hose inside the burning building is trusting the pump operator with his/her life, so...