ive never seen a 737 as cargo... accordibg ti wikipedia, fedex, out of the boieng party, only had 757 and 727s i believe. why dont they choose the 737? its efficient, spacious? instead they go with airbuses a300s and mcdonald douglass md11s...

Try a google search for 737-200F, 737-300F and 737-400F. That will show up some pics of some freighters. Can't say whether these were actually manufactured by Boeing as freighters or normal passenger liners converted by airlines.

It seems to me their just made by Boeing as a freighter, since they have no windows.

They are converted passenger aircraft. Some purpose built ones were the qc for quick change and the cobi aircraft.

Ahhh. I didn't know. I wish somebody would make those liveries for 737NGX.

Their is a lot of 737-200 Combi's flying around in Canada's arctic. They are converted from passenger planes and also fitted with a gravel kit to allow them to land in remote airstrips. Canadian North is one of those operators:http://en.wikipedia..../Canadian_North