http://www.dieseltruckresource.com/classifieds/showproduct.php?product=16801&cat=8

I am new to this but would this work in a 99? I thought that 98.5 to 2002 were the same?

different programming on the 98-00 and 01-02

sidenote: also 01 chip will fit an 02 but needs a special adapter for the map sensor because they are different

Thanks. That will be good info for the future.