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Welcome to the Navistar Supplier Network

The purpose of this website is to provide a responsive, secure environment within which Navistar and the Supply Chain can partner in innovation to achieve world-class material, cost, quality, and delivery performance.

For notifying Navistar of data breaches, email NAVCERT@NAVISTAR.COM

Please Read : Starting on October 23rd, 2020 you will be prompted to complete Contact Method Registration. Refer: Update: Review Contact Method Registration Communication under "What's New" section dated 10.06.2020

For Procurement’s Source to Contract Portal questions or information, email For direct access to the Portal, click here.

For ESL questions or information, please click here

For iSupplierPortal technical support issues, email

For Logistics questions or information, call 888-518-6388 for assistance from the Ryder Logistics, or click here for a detailed contact list.

For S-Rating questions or information, email Please refer to this link for an overview of our S-Rating launch, or here for a step-by-step walkthrough of the process.

For Navistar Defense supplier information, see

For Supplier Scorecard questions or information, email

For Supplier Quality questions or information, email  Learning modules are also available at

For Conflict Minerals questions or information, email

For Electronic Payments Migration Initiative questions or information, click here

For IMDS questions or information, email

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