Bostech WP02201 Water Pump

2003 Models: If you have a 2003 you are in the 2003-2004.25 production date.

2004 Models: If you have a 2004 model you must check your VIN code to determine your production date.

2005 Models: If you have a 2005 or newer, you have a 2004.25 and newer production date. 

A sample VIN code is: 1FTRW21P24EB10150. In the middle of the VIN code, you see the digits "4EB". The 4 means that it was a 2004 model year. The "E" denotes which production plant built your truck. In this case, E is for Kentucky. Lastly, the "B" is the start of the sequence number (the last 6 digits of the VIN). Some early 2004 models have a "4EA" code. The "A" denotes the early build and most likely is a 2003-2004.25 production date. For example letter "B", "C", "D" or more all denote later model 2004 builds with 2004.25 and newer production dates, or if the water pump is already off the truck you can measure the impeller.