I would run 5inch marlin springs and after they settle they will give you plenty of clearence for the 37s but if you need more clearence than that youcan always install a sky manufacturing 1inch body lift
BigMike is running 4" with 37's right now. I don't see the need for 5"
![My Two Cents :twocents:](https://board.marlincrawler.com/Smileys/marlin/twocents.gif)