"...full time AWD..."
The ONLY method I know of for FULL TIME AWD on a base FWD vehicle, sideways mounted engine, is to have three fully open differentials, front, center, and rear, say as in the Highlander, Sienna, and RX series.
Well, come to think of it, there is the HH and RXh wherein both front and rear drives can be engaged simultaneously on a high traction surface without damage from driveline windup.
Otherwise:
FULL TIME F/awd functionality right up until just one wheel slips/spins. then you suddenly have a ONE-WHEEL drive vehicle.
What you more likely mean is F/awd is ENABLED at all times.
Is the Haldex GEN IV used in a base FWD vehicle..??