Optional transfer case with selectable two-wheel drive (2WD) and four-wheel drive (4WD) for the BRX01 All-Wheel Build (AWB).
Check out the BCF2™ 2-Speed scale transmission gearbox.
If you're looking for an edge on extreme crawling, or on a quest for a more scale realistic 2WD/4WD transmission to have fun with, one of these three transfer cases will do the trick.