Dorman 635-786 Engine Rear Main Seal 14-25 Chevy Silverado 1500 GMC Sierra 1500
Confirm Fitment Before You Buy
Not sure it fits? Message Year/Make/Model/Engine (2WD/4WD if applicable) and we’ll help confirm compatibility.
Why buy from Koskowski Automotive?
• 50+ years (since 1972) • Dorman Authorized Seller • Fast shipping • Easy returns
Regular price
$73.91
Select your vehicle at the top of the page to check fitment.
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Vehicle Fitment: Use the table below to match your exact configuration. If you don’t see your exact setup, message us before ordering.
This direct replacement rear main seal cover matches the fit and function of the original equipment cover for a reliable repair. This part has undergone extensive testing to ensure adherence to precise design standards.
- Direct replacement - this rear main seal cover matches the fit and function of the original equipment cover for a trouble-free installation
- Durable construction - this rear main seal cover is made of quality materials for a reliable fit and enduring service life
- Convenient solution - get a quality repair solution without the hassle of buying original equipment
- Quality tested - this part has undergone extensive testing to ensure a quality fit and long service life
Vehicle Fitment
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2017 | Cadillac | CTS | 6.2L V8 | |
| 2021-2025 | Cadillac | Escalade | ||
| 2019-2020 | Cadillac | Escalade | 6.2L V8 | |
| 2018 | Cadillac | Escalade | 5.3L V8 | |
| 2015-2017 | Cadillac | Escalade | 6.2L V8 | |
| 2018 | Cadillac | Escalade ESV | 5.3L V8 | |
| 2015-2020 | Cadillac | Escalade ESV | 6.2L V8 | |
| 2020 | Chevrolet | Camaro | 6.2L V8 | |
| 2017 | Chevrolet | Camaro | 6.2L V8 | |
| 2021-2025 | Chevrolet | Cheyenne | ||
| 2020 | Chevrolet | Cheyenne | 6.2L V8 | |
| 2020 | Chevrolet | Cheyenne | 5.3L V8 | |
| 2014-2017 | Chevrolet | Cheyenne | 6.2L V8 | |
| 2014-2017 | Chevrolet | Cheyenne | 5.3L V8 | |
| 2020 | Chevrolet | Corvette | 6.2L V8 | |
| 2015-2017 | Chevrolet | Corvette | 6.2L V8 | |
| 2020 | Chevrolet | Express 2500 | 5.3L V8 | |
| 2018 | Chevrolet | Express 2500 | 5.3L V8 | |
| 2020 | Chevrolet | Express Cargo | 5.3L V8 | |
| 2018 | Chevrolet | Express Cargo | 5.3L V8 | |
| 2020 | Chevrolet | LCF 3500 | 5.3L V8 | |
| 2020 | Chevrolet | LCF 3500 | 6.2L V8 | |
| 2016 | Chevrolet | LCF 3500 | 5.3L V8 | |
| 2016 | Chevrolet | LCF 3500 | 6.2L V8 | |
| 2020 | Chevrolet | Silverado 1500 | 5.3L V8 | |
| 2020 | Chevrolet | Silverado 1500 | 6.2L V8 | |
| 2014-2018 | Chevrolet | Silverado 1500 | 5.3L V8 | |
| 2014-2018 | Chevrolet | Silverado 1500 | 6.2L V8 | |
| 2014 | Chevrolet | Silverado 1500 | 4.3L V6 | |
| 2019 | Chevrolet | Silverado 1500 Legacy | 6.2L V8 | |
| 2019 | Chevrolet | Silverado 1500 Legacy | 5.3L V8 | |
| 2014-2018 | Chevrolet | Silverado 2500 | 5.3L V8 | |
| 2018-2020 | Chevrolet | Suburban | 6.2L V8 | |
| 2015-2020 | Chevrolet | Suburban | 5.3L V8 | |
| 2018-2020 | Chevrolet | Tahoe | 6.2L V8 | |
| 2015-2018 | Chevrolet | Tahoe | 5.3L V8 | |
| 2020 | GMC | Savana 2500 | 5.3L V8 | |
| 2018 | GMC | Savana 2500 | 5.3L V8 | |
| 2021-2025 | GMC | Savana 3500 | ||
| 2020 | GMC | Savana 3500 | 5.3L V8 | |
| 2018 | GMC | Savana 3500 | 5.3L V8 | |
| 2020 | GMC | Sierra | 6.2L V8 | |
| 2020 | GMC | Sierra | 5.3L V8 | |
| 2014-2018 | GMC | Sierra | 6.2L V8 | |
| 2014-2018 | GMC | Sierra | 5.3L V8 | |
| 2020 | GMC | Sierra 1500 | 5.3L V8 | |
| 2020 | GMC | Sierra 1500 | 6.2L V8 | |
| 2014-2018 | GMC | Sierra 1500 | 5.3L V8 | |
| 2014-2018 | GMC | Sierra 1500 | 6.2L V8 | |
| 2019 | GMC | Sierra 1500 Limited | 5.3L V8 | |
| 2019 | GMC | Sierra 1500 Limited | 6.2L V8 | |
| 2015-2020 | GMC | Yukon | 6.2L V8 | |
| 2015-2018 | GMC | Yukon | 5.3L V8 | |
| 2020 | GMC | Yukon XL | 5.3L V8 | |
| 2015-2018 | GMC | Yukon XL | 5.3L V8 | |
| 2015-2017 | GMC | Yukon XL | 6.2L V8 |
Please confirm the part number and your vehicle's year, make, model and engine before ordering. Questions? Message us with your VIN and we'll check fitment for you.
Specifications
| Brand | Dorman |
|---|---|
| Part Number | 635-786 |
| UPC | 194883248489 |
| Material | Steel |
| Color | Metallic Gray |
| Thickness | 0.66 in. |
| Mounting Hole Quantity | 14 |
| Mounting Hole Diameter | 0.4 in. |
| Grade Type | Standard Replacement |
| Inside Diameter (in) | 2.075 in |
| Package Contents | 1 Engine Rear Main Seal; 12 Bolts |
| Width (in) | 10 in |
| Country of Origin | China |
| Warranty | Limited Lifetime |
OE & Interchange Numbers
| 12665077 | General Motors (OE) |
|---|---|
| 12617790 | General Motors (OE) |
| 12705663 | General Motors (OE) |