Navistar Supply Chain Quality: Trimco Partnership Analysis

Introduction and Company Overview

Navistar International Corporation, formerly known as International Harvester Company, is a U.S.-based holding company that manufactures International brand commercial trucks. Located in Warrenville, Illinois, the company operates with approximately 500 employees and generates revenues of almost $10 billion. Through a network of approximately 1,000 dealer outlets in North and South/Central America and more than 90 countries globally, Navistar sells parts and service contracts for large truck machinery. The company has recently expanded into financing for its customers and distributors, broadening its market reach.

However, Navistar has faced significant criticism for its corporate practices. The company spent over $6 million on lobbying efforts between 2008 and 2010 while paying no corporate income taxes and instead receiving over $18 million in tax rebates—all while achieving a profit of nearly $900 million and increasing executive pay by over 80% (Portero, 2011).

The primary operational issue examined in this case involves Trimco Industries, a key supplier of trim-kit components for Navistar's final assembly process. Trimco's products have an unacceptable margin of error stemming from multiple sources: inefficiencies and inadequate training within Trimco, poor communication between the two organizations, and insufficient quality control practices in both companies. This analysis recommends addressing these problems through improved supply chain communication via integrated technology and the implementation of Lean Six Sigma manufacturing and production protocols.

Issues Identification and Problem Scope

Quality improvement has been a cornerstone of Navistar's company culture for decades. The organization has historically promoted three fundamental tasks: establishing clear performance expectations for employees, providing necessary knowledge and training to meet those expectations, and dedicating managerial time and expertise to empower employees in achieving required standards.

Despite these long-standing initiatives, in June 1997 company managers identified a serious quality issue affecting delivery and production across multiple product lines. Specifically, assemblers at the Chatham facility could not consistently install interior trim into truck cabs due to missing, broken, or inappropriate parts. Interior trim includes floor paneling, mats, carpeting, handles, and interior panels, while external trim encompasses reflectors, horns, lights, door handles, bumper trim, and decorative chrome.

Prior to this period, the company had employed a system of pre-assembled kits designed for specific truck models, ostensibly containing all necessary components for final assembly. These kits included up to 26 individual parts with a direct material cost of $600 to $800 each. Following principles reminiscent of Henry Ford's assembly line, these kits traveled through the assembly process in specialized containers called "cabooses," positioned directly in front of the specific vehicle requiring those components.

The tactical problems became evident: assembly workers experienced difficulty locating or accessing parts within the caboose, line slowdowns occurred due to the need for reordering parts, material handling and post-assembly installation required excessive time and resources, and delivery delays resulted from inconsistent caboose quality across different units. These compounding issues cost the company over $200,000 annually in direct costs, with delays ranging from hours to days and substantially impacting customer satisfaction ratings.

Environmental and Root Cause Analysis

Supply chain and logistics challenges rarely have single or simple solutions. In this case, Navistar contracts over 450 trim part types to Trimco Industries, which supplies both the Chatham and Springfield plants with total yearly deliveries exceeding 400,000 individual parts. The defect rate on these parts is approximately 3,100 units annually, representing a 7.7% error ratio—far too high for a company of Navistar's scale and expertise.

Investigation revealed that Trimco's automation capabilities and quality control procedures were inconsistent. Some custom parts required significant manual labor, including cutting and sewing processes. Moreover, Trimco's quality control procedures varied depending on the production shift, manufacturing technique, and specific part ordered. Due to a lack of centralized systems and primitive computer infrastructure, Trimco struggled to accurately monitor outgoing parts, sometimes shipping incomplete orders or sending parts with missing components.

Error patterns lacked consistency; defects might involve truck panels one day and chrome components the next, making it difficult to track longitudinal error data and identify systemic issues. A critical underlying factor was high employee turnover at Trimco, which compromised the organization's ability to maintain expertise and consistent training levels. Trimco employees struggled to accommodate Navistar's design changes, which might include repositioning trim components, altering part sizes or locations, or changing materials and colors.

Communication between the organizations was inadequate. While both companies employed a Just-in-Time (JIT) inventory system, delays of up to five days between order placement at Trimco and delivery to Navistar's Chatham facility left insufficient time to identify and correct problems before parts reached the assembly line.

Analysis identified seven distinct categories of defects affecting the Trimco-Navistar relationship, each with unique causes and consequences:

Seven Categories of Trim Kit Defects

Missing Parts. Shortages of materials at Trimco combined with employee errors resulted in kits being shipped incomplete. Assembly workers faced delays when necessary components were absent, requiring additional orders and waiting periods.

Defective Parts. Quality control issues at Trimco meant that defective parts were either undetected or ignored before shipment. Once identified at Navistar, these parts required scrapping or return shipment to Trimco for replacement, creating additional delays and costs.

Damaged Parts. Sloppiness in Trimco's manufacturing processes, combined with improper packaging and sometimes inadequate storage at Navistar, resulted in parts arriving damaged beyond installation capability. Damage could occur during manufacturing, during transportation, or in storage, frequently due to insufficient protective measures.

Incorrectly Punched Parts. Despite the use of templates, Trimco often punched parts improperly, preventing them from fitting into truck interiors. Additionally, design changes implemented by Navistar were not always adequately communicated to Trimco, resulting in parts being manufactured to outdated specifications.

Incorrect Specifications. Significant communication gaps existed between Navistar's engineering department and relevant departments at Trimco. Last-minute product changes from Navistar's engineering team were not consistently conveyed to Trimco, forcing Navistar to retool parts and often rendering them unusable.

Incorrectly Sent Parts. High employee turnover at Trimco created inconsistency in kit assembly. Workers selected incorrect colors, included two right-side doors instead of right-and-left combinations, or assembled kits containing multiple incompatible model numbers rather than components for a single unit. This forced Navistar to reorder and wait for correct shipments, with assembly personnel then required to hunt for missing kits and attempt to match components before assembly.

Supply Chain Management and Industry Standards

Two types of standards apply in manufacturing contexts: ideal standards represent the minimum acceptable performance of a service or product, while practical standards allow flexibility for realistic variations. Research in organizational psychology demonstrates that when standards are in place, performance often improves because people typically seek to meet or exceed standards to demonstrate excellence, achieve competitive advantage, or take pride in their work (Brown, 2006).

For Navistar and Trimco, the supply chain management issue could be addressed through technology integration. Linking the companies' computer systems would eliminate misunderstandings about inventory, responsibilities, shipment status, and quality control completion. This approach assumes both organizations are willing to invest in the partnership—if they are, no technical barriers should prevent improved supply chain coordination.

To address manufacturing errors, Lean Six Sigma methodology offers a systematic approach. Originally developed by Motorola, Six Sigma is a management strategy that improves process quality by identifying and removing causes of errors and variability in production, thereby improving customer satisfaction and return on investment. Six Sigma functions as a tool rather than a mandate, and its effectiveness depends on implementation quality and data accuracy.

The core concept of Six Sigma involves developing and implementing process improvements and reducing defects through comprehensive measurement strategies. By defining and measuring processes, organizations can systematically improve them. The fundamental goal is waste reduction—whether eliminating wasted time, human resources, or material resources—to move more efficiently from point A to point B.

Lean Six Sigma extends this approach further, seeking to produce speed and quality by improving and streamlining all possible processes, creating exemplary customer service and products, and redesigning systems to eliminate inefficiencies. Lean Six Sigma emphasizes streamlining core processes and required outputs to ensure timely, efficient delivery and information flow (George et al., 2004). Applied to the Trimco-Navistar relationship, Lean Six Sigma would identify specific points where defects occur and uncover the exact sources of contention, enabling targeted interventions.

Lean Six Sigma Implementation

The following five-stage control procedure should be implemented at Trimco with input from Navistar:

Stage 1: Identify stakeholders and define how each stakeholder is critical to quality outcomes (multiple stakeholders may be relevant).

Stage 2: Establish measurement systems, recognizing that improvement cannot occur without accurate measurement.

Stage 3: Analyze measurement data to uncover the most relevant and important causes of mistakes, defects, or anomalies within the process.

Stage 4: Develop and implement solutions to remove identified causes of defects.

Stage 5: Maintain excellence by managing ongoing material changes, process changes, and system improvements (Gupta, 2010).

Monitoring and Control Measures

Once these stages are defined and implemented, management can more effectively oversee efficiencies and maintain accountability across both organizations.

Two major recommendations are necessary to continue the Trimco partnership while ensuring higher quality and efficiency in Navistar's products.

First, Navistar should strengthen its supply chain management network by installing compatible computer systems that allow data sharing between organizations. This technological integration addresses communication breakdowns and enables real-time inventory visibility.

Second, both organizations should adopt a Lean Six Sigma model to define, refine, and mitigate errors across the partnership. Implementation should result in proper procedures between organizations, improved hiring and training at Trimco, new communication procedures for design implementation at Navistar, enhanced quality control procedures at both entities, linked inventory systems, established consequences for out-of-specification production, improved shipping procedures at Trimco, better storage procedures at Navistar, and improved error-handling procedures for defective kits.