If your fork has under 50 hours of riding on it you can simply remove your current damper and install the new GRIP2 damper without dropping the lower legs. All you need for this is a bottle of Fox 5wt PTFE Infused Oil for the damper-side lower leg to lubricate the damper, and this is the only oil that you can use with the GRIP2 damper. You will need a 28mm Chamferless Topcap Socket to install the GRIP2 damper, and need a chamferless socket to uninstall the old damper (26mm for GRIP or FIT4 damper, 32mm for RC2 damper). We would also recommend using a syringe to easily insert the oil into the stanchion.
If your fork has over 50 hours of riding on it we would recommend dropping the lower legs and performing a basic lower leg service. You might as well do this to avoid upgrading your fork with a more sensitive damper, only to be potentially held back in performance from sticky lowers that could benefit from a lowers service. For this procedure, you will need Fox 5wt PTFE Oil for the damper-side lower leg, Fox 20wt Gold Oil for the spring-side lower leg, Slickoleum to lubricate seals, a syringe to easily insert the oil into the stanchion and a Fox 8.2mm ID Crush Washer for the air spring. You will need a 28mm Chamferless Topcap Socket to install the GRIP2 damper, and need a chamferless socket to uninstall the old damper (26mm for GRIP or FIT4 damper, 32mm for RC2 damper). We also recommend using Maxima Suspension Clean to clean out the lower legs and Fox Lower Leg Removal Tools to make things easier.
If your fork has over 75 hours of riding on it we would recommend performing a lower leg service and installing new dust wipers since you are at the interval for dust wiper replacement. For this procedure, you will need Fox 5wt PTFE Oil for the damper-side lower leg, Fox 20wt Gold Oil for the spring-side lower leg, Slickoleum to lubricate seals, a Fox 36 Dust Wiper Kit to get new dust wipers/foam rings/crush washers, a Fox 36mm Seal Driver to install the new dust wipers and a syringe to easily insert the oil into the lower legs. You will need a 28mm Chamferless Topcap Socket to install the GRIP2 damper, and need a chamferless socket to uninstall the old damper (26mm for GRIP or FIT4 damper, 32mm for RC2 damper). We also recommend using Maxima Suspension Clean to clean out the lower legs and Fox Lower Leg Removal Tools to make things easier.