I get asked this question on a regular basis at the shop. Because every truck we run {63 of them} has a drop axle I seem to be the one people go to for info on valves and plumbing for drop axles. For anyone on here needing to install a drop axle or having issues with it. Here is a link to the best and simplest way to take care of issues. This a full function valve only need this one valve to do everything. Very easy to install and very reliable, only had one go bad, about $200.00 bucks Can be wired to cab switch and or back-up light switch. Just need a pressure regulator and gauge to go with it. Once installed your problems will disappear. The Link http://cdn.norgren.com/pdf/LACM_5040_Series_IM_Sheet_5-13-15.pdf
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