ATP Parts ZA-506 Automatic Transmission Ring Gear

Automatic Transmission Ring Gear for Ford Applications

ATP Parts ZA-506 is an automatic transmission ring gear built for Ford vehicles that use a 180-tooth setup with a 15.512-inch outside diameter. It is made to replace worn or broken starter engagement teeth and restore reliable engine cranking.

Fits 1977-1997 Ford F-350, N/A; Fits 1977-1996 Ford F-250, N/A; Fits 1977-1989 Ford E-350 Econoline, N/A; Fits 1984 Ford E-250 Econoline Club Wagon, N/A; Fits 1977-1982 Ford E-250 Econoline Club Wagon, N/A; Fits 1977-1984 Ford E-350 Econoline Club Wagon, N/A; Fits 1978-1982 Ford Bronco, N/A; Fits 1977-1982 Ford E-100 Econoline, N/A; Fits 1977-1982 Ford E-150 Econoline, N/A; Fits 1977-1982 Ford E-150 Econoline Club Wagon, N/A; Fits 1977-1982 Ford E-250 Econoline, N/A; Fits 1977-1982 Ford F-150, N/A; Fits 1977-1979 Ford F-100, N/A.

• 180-tooth ring gear for starter engagement
• 15.512-inch outside diameter for confirmed applications
• 14.518-inch inside diameter and 0.44-inch thickness
• 12-pitch flywheel specification
• No ring gear chamfer
• Direct replacement style for Ford automatic transmission applications

Detailed Product Information

ATP Parts ZA-506 is engineered to match the original ring gear dimensions used in the listed Ford truck, van, and Bronco applications. The ring gear teeth engage the starter motor so the engine can crank and start; when those teeth become worn, chipped, or broken from repeated use, replacement is the correct repair. This part cross-references AMS Automotive 4415 for the same application. For Ford F-150, Ford F-250, and Ford E-350 Econoline service work, ZA-506 provides the tooth count and diameter needed for proper starter mesh.

Common Problems This Part Addresses

• Starter motor spins without turning the engine
• Grinding noise during engine cranking
• Broken or worn ring gear teeth
• Intermittent starter engagement
• Crank-no-start condition caused by damaged starter teeth

Installation Notes and Tips

Verify tooth count, outside diameter, inside diameter, and flywheel pitch before installation. Inspect the starter drive and related components at the same time, since damaged starter teeth can quickly wear a new ring gear. Confirm the application against the vehicle’s transmission and flywheel specifications before assembly.

Quality Assurance

ATP ring gears are designed to fit and function like the original part, with dimensions selected for durability and long service life in the listed Ford applications. Part number ZA-506 is built for direct-fit replacement use in automatic transmission service.