G'day Bennie.
T= transmission code
Y=manual trans
75=shaft spacing in mm
X=not 100% but pretty sure it's the bolt pattern
F=dual range
A=model (A=RevA and C=RevC)
D=?
A=?
last two will be the other trans-specific stuff (LSD, etc.). When I replaced the auto box in my RSK the last digit was A=slushbox or B=tiptronic solenoid
I don't think there is a code for final drive though, sorry dude.