Are GMC and Chevrolet parts the same? GMC part lookup by VIN

Which GMC and Chevrolet models share parts

Match the generation before you match the badge. A 2018 Sierra and a new-body 2019 Sierra 1500 sit on different platforms, and for 2019 GM also sold the older truck as the Sierra Limited. Its bulletins list them as separate vehicles.

• Sierra and Silverado: GMT800 from the 1999 model year, GMT900 from 2007, K2XX for the 2014 to 2018 light-duty trucks and T1XX since the 2019 Sierra 1500.
• Yukon and Tahoe, Yukon XL and Suburban: GMT400 (the Yukon from 1992), GMT800 (2000 to 2006), GMT900 (2007 to 2014), K2XX (2015 to 2020) and T1XX from the 2021 model year.
• Canyon and Colorado: GMT355 (2004 to 2012), the 31XX trucks sold as 2015 to 2022 models, and the third generation that arrived for 2023.
• Acadia and Traverse: GM’s Lambda platform carried both during the first Acadia (2007 to 2016), and they share a platform again from the 2024 model year. The 2017 to 2023 Acadia was cut down to mid-size while the Traverse stayed full-size.

What crosses between the badges

Under the body a matched pair is one truck, and GM’s service bulletins treat it that way. Bulletin 23-NA-201, dated December 2023, covers a loss of steering and brake assist on the 2019 to 2022 Silverado 1500 and Sierra 1500. It lists one engine-to-body ground strap for both: 84827778.

Bulletin 19-NA-136 goes wider. Its transfer case fluid, 88865601, applies to the 2015 to 2023 Tahoe, Suburban, Yukon and Cadillac Escalade, the 2015 to 2022 Colorado and Canyon, and the Silverado and Sierra from 2014. Canada gets the same fluid as 19421425, a reminder that a number can change with the market while the part does not.

Engines, gearboxes, axles, transfer cases and most suspension and brake hardware follow that pattern on a pair from the same generation. That is where a Chevrolet number you already hold is most likely to fit the GMC.

What stays GMC-only

The front end is where the brands split. On the 2000 to 2006 SUVs, the grille, the headlights and the body-side moldings were all that told a Yukon from a Tahoe. On the 2015 to 2020 Tahoe and Yukon the front fascias differ, while the bodies behind the A-pillars carry the same styling.

Some GMC hardware has no Chevrolet twin at launch. The 2019 Sierra 1500 offered a two-piece tailgate whose inner panel folds into a step or a load stop, a carbon-fiber bed and a 3-by-7-inch head-up display. Trim follows the badge as well: SLE, SLT and Denali on the K2XX Sierra against LS, LT and LTZ on the Silverado.

Order any panel, lamp or trim piece from the VIN, never from a photo of the other brand.

One catalog, one numbering system

GM runs no separate GMC numbering. Its part numbers are eight flat digits with no brand prefix, as in 84827778, so a shared part has one number whichever badge sits on the grille.

Where two trucks of one brand differ, the split often follows an RPO code. Bulletin 19-NA-136 applies only to trucks with certain RPO codes, among them NQ6 and NQH. For 2022 there are two Sierra 1500s: the carried-over Limited under RPO J21 and the new truck under J22. The fifth character of the VIN separates them, 8 or 9 on the Limited and H or U on the new one. Our post on GM RPO codes shows where to read the codes on the vehicle.

GMC part lookup by VIN, step by step

Check the 17-character VIN first with the free VIN decoder so you know the model year and body before you open a catalog.

Enter the VIN in the GMC catalog. The GM catalog applies the build and its RPO codes, so parts for other cabs, axles and trims drop out. Open the assembly, read the eight-digit number and follow any supersession to the current one.

To test a part from a Chevrolet, enter the Chevrolet VIN in the Chevrolet catalog, open the same diagram and compare the numbers. Matching numbers mean a shared part. If the numbers differ, so do the parts, whatever the pictures suggest. GM’s bulletins give technicians the same instruction: take the part number from the Electronic Parts Catalog for that VIN.