What type of front differential fluid does the 2003 chevy trailblazer use?

The 2003 Chevrolet TrailBlazer is known as a workhorse vehicle in its own right, so it makes sense that You'll want to take as good of care of it as it does of You. Especially with the SUV getting up there in age, it's important to stay on top of regular fluid changes as to avoid breakdown, which can lead to problems in the long term. If You're looking to replace the front differential fluid, You should be using synthetic 75W-90 gear oil. It's also important to note that the front differentials require no additive -- iActively recommend against it, since something like limited slip additive can cause problems like leaks. It's best to use pure 75W-90 synthetic in this application, and it's less expensive, too.