Walker 84777 Catalytic Converter

Overview

Walker CalCat 84777 is a direct-fit catalytic converter built for specific applications that require CARB compliance and OE-style fitment. It is engineered for vehicles with OBDII or non-OBD systems and uses a stainless steel body with a ceramic substrate for controlled exhaust treatment.

Compatible With Chevrolet Silverado 1500, Chevrolet Tahoe, GMC Sierra 1500, and related applications listed below, this catalytic converter is part of the Walker CalCat line. The 84777 part number is also referenced for AP Exhaust 774766 in the same application.

Key Features

• CARB certified for applications that require California emissions compliance.
• Direct-fit design for a precise OE-style installation.
• Stainless steel body with steel tubing for corrosion resistance.
• Ceramic substrate and three converter bodies for emissions control.
• Heat shield attached for added thermal protection.
• Pre- and post-converter oxygen sensor ports with specific inlet and outlet configurations.

Detailed Description

Walker CalCat 84777 is engineered as a premium catalytic converter for emissions repair on specific GM and Cadillac applications. The design includes two inlets, one outlet, four sensor ports, and a ball-style outlet, along with a 3-bolt welded flange on one inlet and a 3-bolt loose flange with spherical flare on the other. These details support a direct replacement that matches the original exhaust layout more closely than a universal converter.

The Walker CalCat product line focuses on direct-fit emissions components that meet CARB standards where required. For buyers searching for a catalytic converter for Chevrolet Suburban 1500, Chevrolet Avalanche, GMC Yukon XL 1500, or Cadillac Escalade, part number 84777 provides a specific-fit solution with the construction and certification details needed for regulated applications.

What It Helps Fix

• Failed emissions testing related to catalytic converter efficiency.
• Check engine lights tied to catalyst or oxygen sensor performance.
• Exhaust restriction caused by a damaged or deteriorated converter.
• Fitment issues from using a non-specific replacement converter.
• Compliance concerns on CARB-regulated applications.

Installation Notes

Verify the inlet flange style, outlet type, sensor port count, and overall exhaust configuration before installation. This part does not include clamps, gaskets, or mounting hardware, so the existing system should be inspected for wear before replacement. Confirm the vehicle application against the listed fitment data for Chevrolet Silverado 1500, GMC Sierra 1500, and the other supported models before ordering.

Quality Assurance

Walker CalCat converters are designed, tested, and validated to meet CARB standards for the listed applications. Part number 84777 is built as a specific-fit emissions component with OE-style dimensions and certification-focused construction.