What's an 833 o/d from a truck worth?

The van version was a short shaft like the A bodies.

Not true as noted above

They don't hold up well with any type of horsepower in front of them because of the way the torque is routed through the secondary shaft .

This is true of all OD's regardless of what they were in. In "3rd" gear which is the "old" 4th gear they are as strong as a 4 speed, so heavy loads, trailers, etc. or hard on the throttle.

OD was designed for just what it was designed for........cruising at speed