1400 series pumps are identical to the 1300 series pumps in appearance, but the looks are deceiving. These pumps are manufactured with completely different internal components than the 1300's. The heart of the 1400 pump is a larger ring and rotor which displaces more fluid per revolution. This makes this pump the pump of choice for Rock Crawlers that operate at low engine RPMs and have extensive steering modifications. WARNING!!!! MUST USE A POWER STEERING FLUID COOLER WITH THIS HIGH PERFORMANCE PUMP TO KEEP FROM DAMAGING PUMP.