I have been wanting to know all this myself. Doing a search, I couldn't find a definate answer on how to decipher the codes, lots of threads about it, but none that have all the answers for 32s,33s,34s...
I think we need to get on this somehow... ANYONE READ JAPANESE???
Best I can get for yours is this...
G = 2door
GK = RB25DE , RB25DET
B = 2wd
R = ???
T = GTT,GTV,GTXT,GT4,GT4/L,GTX4
F = 5 speed
R34
U = ???
D = ???
A = ???
A = ???
J = ???
J = ???
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*Edit: and if anyone can crack these, here is mine, have at it.