How to Check the Fluid in a Jeep Wrangler With a Manual Jeep Wrangler manual transmissions are durable. However, checking the transmission fluid in your Jeep Wrangler is an essential part of proper maintenance. If you let the transmission fluid in your vehicle get too low, it can cause major damage and could potentially result in a ruined transmission. Follow these steps 2001 Jeep Wrangler Transmission Fluids, Oils, Additives CARiD is well-known for the quality parts and accessories all over the world. If you need to change the transmission fluid in your 2001 Jeep Wrangler, be our guest!