The Lancia Delta HF 4WD and 8v Integrale had 56/44 torque split. Those cars won three championships. It wasn't until the 16v version (San Remo 1989) that it was changed to 47/53. But yeah, different times, different cars.
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Thanks for the information. That's new for me.
http://www.awdwiki.com/en/lancia/#Lancia_Delta_HF
Actually I'm not sure. Was that allowed to be changed in Group A?
I guess it was allowed because I think that Toyota didn't use same viscous coupplings on gr.A cars as on stock cars and those continuously change the torque split (although not in a very controlable way).