Achim Korden, known from his "RingMini" (a Honda-powered Mini driven on the Nurburgring in Germany), has built a pickup with a 4wd system. I don't know what components he used, but maybe you can find out on his Facebook page/between his Facebook pictures: https://www.facebook...ringmini/photos. Now I'm reading this: https://hirundomotor...ject-squirrell/
and it seems he converted his saloon to 4wd as well, using a Honda CRV drive system.
I believe the that pick up used a Honda Civic Shuttle 4wd system.