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Tech Tips :: C4 Related Tech Tips :: C4 Rear Axle Recommended Maintenance

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The rear axels in C4 Corvettes are from Dana Corporation http://www.dana.com/ GM does not specify a service interval in the owners manual. Dana Corporation makes the following recommendations: 1. If there is any possibility of water contamination the oil needs to be changed immediately. 2. If the axle temperature spend a lot of time at or above 275F, the oil should be changed every 30,000 miles and the set up and bearings should be checked every time. This should only be a factor when you are getting a good amount of track time. 3. Under normal use, the oil should be changed at 75,000 miles. 4. If you are getting chatter (noise) from the rear end, you may want try changing the oil or at least adding some limited slip additive. Dana Corp says that the factory oil is adequate, but synthetics are superior especially when heat is an issue. A limited slip additive should always be used. Gear oil should have a GL-5 rating and a 75w-140 or 75w-90 weight, with 75w-140 being the preferred weight.