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PDFD - porsche dynamic four wheel drive I think. As stated previously , it’s to get unstuck from sand , snow and not for shift on the fly. Normally , C4 send 31%. power to front axle and 69% to rear but engaging Traction program ( clockwise rotation) allows equal power front & rear as diffs are locked up.
Works up to 18 mph and auto release around 25 mph. You don’t want to normally drive around engaged in this mode as handling will suffer greatly. It is for getting car unstuck. I read this system was adopted from 959 - rally anyone. I’ve never tested mine and don’t plan on it. BTW, I believe the modern 4’s still start out with this 31/69 split and varies accordingly. At least my 991.1 did.
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