Trany — Naylon: Over time, heat and old fluid make the nylon brittle. If a bearing cage shatters, it can send debris through the gears. If your car has one of these transmissions, follow these steps to extend its life: naylon trany If you are rebuilding the transmission, many enthusiasts look for . Replacing the nylon components with brass or steel during a rebuild eliminates the "brittle" failure mode and makes the transmission much more durable for spirited driving. : Over time, heat and old fluid make the nylon brittle : Nylon is sensitive to the chemical breakdown of old oil. Change your manual transmission fluid (MTF) every 30,000 to 50,000 miles. Replacing the nylon components with brass or steel : Many of these units (especially Saturns) actually use Automatic Transmission Fluid (ATF) or a very specific synchromesh fluid. Check your owner's manual—using the wrong weight can melt or swell the nylon parts. : It was cheaper to produce during the height of the economy car era. 🛠️ Common Issues & Symptoms |