The Chelsea 5P1187 is a genuine Chelsea adapter gear for Chelsea PTO units. Adapter gears serve as the interface between the PTO and the transmission’s PTO opening, making correct part identification critical before ordering. Chelsea PTOs are among the most widely used power takeoff units in the heavy-duty truck market, and maintaining correct gear specifications is essential for proper engagement and power transfer. Pro Gear and Transmission carries Chelsea PTO parts for fleet shops and independent mechanics. Call us to confirm this adapter gear is the right fit for your application before ordering.FeaturesGenuine Chelsea part number 5P1187Adapter gear for Chelsea PTO unitsDesigned for proper PTO-to-transmission interfaceCall Pro Gear and Transmission to confirm application fitUsed in these Chelsea PTO models236 Series442 Series447 Series626 Series628 Series630 Series645 Series