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Your 2000 Chevy Silverado takes sae 75w-140 differential fluid for the front. The differential helps your vehicle manage the difference in wheel travel when you make a turn. It's advised to have the differential fluid replaced every 30,000 to 60,000 miles by a qualified mechanic, as it can be a messy task. Changing the old fluid in your car can improve its performance and protect the gears from damage. Low or dirty gear oil can result in noisy or whining gears when they rotate.
A 2000 model of the Chevy Silverado requires SAE 75W-140 differential fluid for the front axle.
Avoid using 75w140 oil in the front because it is too viscous. Instead, opt for 80/90 conventional oil. If you anticipate tough conditions, consider using synthetic oil.