I have an idea here . I eventually plan of running vents from diffs into a cage tube someday . In the meantime , what if I run my rear diff vent into the evap hose on the frame . Won't need evap , may be scoring a different non rusty tub . This is on an 83 frame , so the vent will run up front , crossover , and be right next to the front diff vent at the front frame by the gearbox . Then just a simple filter on top of each next to radiator ?