[Yukon Jack]

Rancho shows the RS5112 for the rear and RS5001 for the front for lifts of 2 1/2 to 4".

The RS5112 is 16" compressed, 26.250 ext. with 10.250" of travel.

The RS5001 is 13.250" compressed, 21.125 ext. with 7.875 of travel.

That should give you a ballpark.

If you are building a flex monster, the best thing to do would be to go measure your vehicle as it sits level and see if the above measurements put you at about halfway between those measurements.

If you're building the truck for alot of hard offroad use you probably should go cycle your suspension and take measurements at full stuff and full droop.