tranny issues

so i'm probably gonna rebuild the trans i have for my car. i'm trying to figure out whether or not it's a world-class. i took the input shaft out and the blocker ring is yellow, suggesting it's made of brass, and that would make it a world class. when i get the countershaft out and see its bearings i'll know for sure. i tried checking by the part number but it's not in the lists in the service manual. last three digits on the case are 904.

if it's not a WC i'm gonna rebuild it as one. anybody know where i can get gears and such for it? i'll try D&D performance first, they're local. any other suggestions would be appreciated.

one quick question stangnut . Did they put world class trans in some from the factory?

one quick question stangnut . Did they put world class trans in some from the factory?

http://www.ddperformance.com/Trans%20ID%20chart.htm

that's a list of the WC trans part numbers. not sure exactly how to interpret that as far as stock parts goes, but i'm sure they put them in cobras as well as some of the later fox GTs.