About the same time as it took for the Sprinter.
Definitely more likely. Perhaps if someone had a wrecked Journey donor car they could at least get the front end sorted out and then combine it with the rear axle from the one in coastie's post.... Dodge could do it easy. The entire drive train in the Promaster is the same as the Dodge Journey, which can be ordered in all wheel drive.
how in demand is an AWD system?
also how possible is it that they will offer it from factory?
If one van manufacturer came out with a 4x4 they would have a big edge on the rest of the field. You just have to look at Quigley and the number and cost of vans that they convert to 4x4. Most manufacturers could easily cut in half the Quigley conversion cost and still make a nice profit.
II always thought the Peugeot and Citroen versions had more options because they had a wider market share in export markets where ESP is not so popular, so it would allow them to fit a true locker differential into those ones.Boxer and Jumper have more options. You can add to the transmission more features to increase the traction on rough terrains or off road protection. Probably the Dangel company being french, has a better relationship with the PSA group...
The next model minivan reportedly will have AWD capability in combination with Pentastar and 9-speed transmission. Adapting to "gasoline" PM would not be easy but probably doable. The driveshaft would go through fuel tank and there is no driven rear suspension for the PM. These should be minor design issues for a major company like Fiat/RAM if it was done as an OEM option.Probably not much chance that would work with the Pentastar. It would have to bolt on or replace to the existing final drive in some way. If the US Diesel trans will be same as Europe, then maybe.
Not even sure how a "bolt on" installation would work if power is taken off after the differential. You'd have to take power off both half-shafts and recombine them back with another diff. I'd like to see the details of that kit.