A904 vs A999

whas this it?
http://www.moparmusclemagazine.com/projectbuild/155_0404_1989_dodge_diplomat_transmission/index.html

seeing as the a500 trans is a OD 904 from this here is the gearing, for the 3 then.
http://en.wikipedia.org/wiki/TorqueFlite
1-2.74
2-1.54
3-1.00
4-0.69
R-2.21