The Chelsea 37P45 is a C/S Spring designed as a replacement component for Chelsea power takeoff units. Springs of this type maintain proper clutch or shift engagement within the PTO assembly, keeping internal components operating as designed. Pro Gear and Transmission carries genuine Chelsea PTO parts, including hard-to-find internal components like the 37P45. If you need help confirming this is the correct spring for your Chelsea PTO, give us a call before ordering.FeaturesGenuine Chelsea replacement C/S SpringPart number 37P45Designed for use in Chelsea power takeoff assembliesDirect OEM-style replacement for the original springUsed in these Chelsea PTO models540 SeriesStud Kits