If you are referring to the spur gears on the rack and pinion hydraulic actuation system The job is fairly straightforward and I believe it is documented in some Lippert literature. You will need a hydraulic jack and some wooden blocks to offload some of the weight of the slide. You will also need a helper. The job takes about 2 to 4 hours. I replaced both spur gears on the kitchen side slide because a couple of teeth broke off of both gears. When replacing the gears, be sure to closely examine the rack and remove any broken gear teeth that have become wedged in the rack.
Lippert changed the design of the gears and rack because the early units used gears with teeth that were too thin. I believe the earlier units like mine used gears that had 18 teeth and newer units have gears with 15 teeth allowing for more metal in each tooth. Be sure to get the correct gear for yours.
2012 Redwood 31SL chasing 2019 Denali HD 3500 Duramax SRW