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The Allison Transmission Filter Pressure Switch watches pressure at the transmission filter and reports it as a simple on-or-off electrical signal. A diaphragm inside moves as pressure rises or falls, and its electrical contacts open or close at a set pressure. The control module cannot see the fluid itself, so it relies on that signal to know what the filter circuit is doing. The Allison Transmission 29506484 supplies that report, and replacing it addresses the switch alone without touching the filter or the module.
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