Don't get hung up on 10" stroke.
What you need is the retracted length to be 13.5"
If a 10" stroke cylinder meets that requirement, you will be fine. It just won't extend but 8", which will be the physical limit of the plow when the opposite cylinder is fully compressed.
A crossover relief is a good idea to protect from blown hoses/damage. And they do NOT work on a DA cylinder in compression.
Contrary to what some have said, the cylinders will handle the tractors pressure. Most truck plows are set for similar to what tractors run....2200-2600 psi or so. But the pressure has NOTHING to do with speed. That's all in the flow and how many GPM your tractor is.
