Originally Posted by Michael Ophus
four wheel drive is not built for speeds above about 25 miles per hour as i understand it. (the 1970s and before)
I don't believe there are speed limitations for 4WD (high setting) in today's systems. That being said, turns should be made gently and the system should not be used on high traction surfaces (dry pavement). It sounds like the Quadvan 4X4 system was used appropriately on snow and at a reasonable speed. Very sorry to hear about the issues.
2017 MR T150 Cargo Van, 148" WB, Quigley 4X4, 3.7L V6, 3.73 LSA