View 8 Photos View 0 Videos 1977 Chelsea 420 Series Air Shift Bottom Mount PTO w/ Tyrone PM23 Pump, Part # 420WQAHX-A3XK $500 USD Chelsea 420 Series PTO w/. Attached Tyrone PM23 Hydraulic Pump. Bottom Mounted, Removed From RTO12513 Transmission. PTO: 6 Hole Mount, Air Shift, .865 Gear Ratio, P/N 420WQAHX-A3XK. Pump:... ConditionUsedFits To Make(s)GMCFits To Model(s)GENERALStock Number1605-8 MLS Number13894126CategoryPower Take Offs (PTO) & Parts Last Updated4/22/2026 LocationFresno, CA, US Sold ByGarabedian Equipment (855) 794-___ SHOWNUMBERCall Seller Email Seller Save More Info