Suspensions can bottom and top out on compression and extension. Because we knew the Two-Week Taco would see some airtime, we removed the coil spring and cycled the Donahoe unit. On full droop, the shock exceeded the range of travel for the stock A-arms, and at full compression (even with the factory bumpstops removed) the Donahoe unit matched perfectly. Another important feature is an internal limiting valve. At full droop, an internal system of valved washers will limit the shock 0.25 inch before it makes metal-to-metal contact. the next time we run into him there could be some big rat motor under the hood.