Ok, here it is for those using ARB Air Selenoids, mount the selenoids so the exhaust is pointing down. Gearman (River City differential, Ranch Cordova, CA) has found that it is possible for a piece of dirt to get lodged in the exhaust tube and cause the selenoid to get stuck open, rendering the locker inop. I know many of the H2 owners are considering installing an ARB up front, so I thought this would be a helpful tip. I re-did mine last night so any openings are pointing down:
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