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The 2003 GMC Sierra 1500 requires dexron-vi automatic transmission fluid, so when buying fluid, make sure it meets these standards. You must check the transmission fluid level at least monthly. Consult your owner's manual to locate the dipstick in the engine compartment; typically, the dipstick handle is yellow or red. With the truck running and engine warmed up, remove the dipstick, wipe it clean, and reinsert it. Verify the fluid level against the warm mark. If it's low, carefully add more fluid using a funnel to avoid spills. After filling, reinsert the dipstick and let the truck idle for a few minutes. Then check the level again to confirm it's full.
My dipstick indicates that dexron 3 is required.
For the best performance, it is advised to utilize Dexron-VI automatic transmission fluid for the 2003 GMC Sierra 1500.