This is a request for quotation for a complete replacement of a tractor rear end, specifically a transmission/differential assembly, including parts, labor, and fees. A single site visit is scheduled for 10 September 2026 from 10:00 AM to 2:00 PM CDT, with pre-registration required and all contractor personnel off-site by 3:00 PM CDT. The acquisition is a total small business set-aside under NAICS code 811310, with a size standard of $12.5 million. All responsible sources may submit a quotation for consideration. No budget amount or performance location is specified.