904....or 998 / 999?

Hi Guys,

i do have two 904´s here to rebuild, one for me, the other one for my brother. I read in another thread that the 998/999 transmissions do have two reinforcing ribs above the rear servo.....the 904´s don´t have them. Both of the trannies i do have here have these ribs.....so i assume these must be 998 / 999´s.

Is there another way to identify for sure? I disassembled the first one (no. 3681843), it has got 4 pinion planetaries and if i remember correctly 4 clutch discs.

The other one is number 4028464, just did not have time to get into it. Maybe someone can give me more info....wanna learn something new!

Thanks!

Michael