Not many people would have expected Ferrari to go to Land Rover for an off the shelf AWD solution for the FF, and they didn't, but even fewer people expected the '4RM' solution that Ferrari came up with. It was a nice piece of lateral thinking that would definitely be best expressed through the medium of film rather than the written word. In simple terms, the FF had two gearboxes. The default drive was to the rear wheels via a Getrag seven-speed dual-clutch automatic, but ahead of the front-mid engine, in line with the front axles, was a secondary two-speeds-plus-reverse transmission that could handle up to a fifth of the engine's torque. This was a helical gearset box like a regular manual, but with two electronically-controlled clutches (one for each wheel) that ran in a constant state of slippage in order to speed-match the two front forward ratios with the (different) ratios of the seven-cogger at the back. The system didn't function beyond fourth gear as the 295/35 tyres on the 20in rear wheels were more than able to take on the engine's output by that point.
Source : https://www.pistonheads.com/news/ph-buying-guides/ferrari-ff-ph-used-buying-guide/44277189