CowRC Udder Butter Waterproof RC Grease, 40 ml Syringe, Precision Applicator for Gears, Bearings, Axles, Differentials, Hobbies, Off-Road. Cow RC

Think about getting the transmission case at the same time. You get bearings for smoother operation, and the aluminum case dissipates heat better than the stock one. https://www.amazon.com/INJORA-Transmission-Housing-Bearings-Aluminum/dp/B0C7QXR57B/ref=sr_1_1?crid=1UYMKRCYZ9RX0&dib=eyJ2IjoiMSJ9.Exn3dTwGh-p6wvR_gFKvf1N6KqCsRiShKS60S6AdDzIPw4ambIELwnB7FC1DUEC9XRdkCUrnPvaRzDm6U8of1Y91BYscbNbRTubXnptxGKzvVe1UPn_T8CHOJsFQ2kuOW1yaF1HlhUkuXcSLMIJ5ZUWygOE8BCh_NDrYnvjDf4325WO_mtRvdB0DuUehQ4R9dRZObnY-ImTl_42f6vHPLAaumh850jgHKGTgvmfUvmq0GlMwy23PHBilVzhXjMaQfYD2eijnnpbrYpGxCBjn1OZbjBpIRCwDiiOVAem4aFY.zjejjKnhUco1R3iFB1UXwt8KWdcM_MJJasLRVUTZSxI&dib_tag=se&keywords=trx4m+transmission+housing&qid=1781741972&refinements=p_123%3A334736&rnid=85457740011&sprefix=trx4m+trans%2Caps%2C180&sr=8-1 Here is a decent video for installing trans gears. How To: Install Traxxas trx4m Crawler Gears | Dripboss RC You will also need to completely grease the gears with some kind of waterproof grease. My preference is Amazon.com: CowRC Udder Butter Waterproof RC Grease, 40 ml Syringe, Precision Applicator for Gears, Bearings, Axles, Differentials, Hobbies, Off-Road. Cow RC : Toys & Games