How to Troubleshoot a Chevrolet Transmission
A Chevrolet transmission is built to be reliable, but even these complicated components can fail after 100,000 miles. In many cases this is because of improper maintenance. Low fluid levels account for many transmission problems, which in turn lead to more serious problems and even total transmission failure. Since fixing a transmission can be expensive, you'll want to troubleshoot your Chevy transmission problems before making any repairs.
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Instructions
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Check the transmission oil level. Pull the transmission dipstick out of the transmission filler neck, which is on the backside of the engine. The dipstick will usually be an orange or yellow looped handle. Wipe off the end of the transmission dipstick on a rag. Put the dipstick back into the transmission and pull it out again. Check the dipstick. The fluid level should be between the upper and lower marks on the end of the dipstick. If it's not, add transmission fluid through the filler neck using Chevy-approved transmission fluid and a funnel.
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Start the engine and shift the Chevy into gear. If you notice a clunking sound as you do this, it is likely the transmission mounts. Chevrolet's transmission mounts do fail occasionally on high-mileage vehicles, especially trucks. A professional mechanic can replace these.
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Check for transmission oil leaks. Older Chevy vehicles are notorious for rear main seal transmission leaks. You'll see a dark red fluid (or a puddle) underneath your vehicle directly under the transmission. This is usually followed by a decrease in transmission oil levels, but it may not be immediately apparent.
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Tips & Warnings
For specific information about your Chevy transmission, consult the particular vehicle's manual (see Resources).
