ATP Parts ZA-505 Automatic Transmission Ring Gear

Automatic Transmission Ring Gear Overview

ATP Parts ZA-505 is an automatic transmission ring gear built for applications that use a 122-tooth ring gear with a 10-pitch flywheel. It engages the starter motor to crank the engine, and it replaces worn or broken teeth that can prevent reliable starting.

Key Features

• 122-tooth ring gear for the listed applications
• 11.19 in. inside diameter and 12.276 in. outside diameter
• 0.35 in. thickness for the specified fitment
• 10-pitch flywheel specification
• No chamfer on the ring gear edge

Detailed Description

ATP Parts ZA-505 is engineered as a direct-style replacement ring gear for a wide range of Chrysler, Dodge, and Plymouth applications. It is specified for automatic transmission use where the starter motor engages the ring gear to start the engine. When the original gear teeth are worn, chipped, or broken, replacement restores proper starter engagement and helps return the crank system to normal operation. This part cross-references Pioneer Automotive Industries FRG-122T and AMS Automotive 4400 for the same application. Fits 1994-1998 Dodge Ram 1500, N/A; Fits 1981-1993 Dodge B150, N/A; Fits 1981-1993 Dodge B250, N/A; Fits 1980-1993 Dodge D150, N/A; Fits 1981-1993 Dodge D250, N/A; Fits 1987-1993 Dodge Dakota, N/A; Fits 1980-1993 Dodge Ramcharger, N/A; Fits 1980-1993 Dodge W150, N/A; Fits 1981-1991 Dodge B350, N/A; Fits 1988-1991 Dodge D350, N/A; Fits 1981-1991 Dodge W250, N/A; Fits 1986-1989 Dodge D100, N/A; Fits 1980-1989 Dodge Diplomat, N/A; Fits 1986-1989 Dodge W100, N/A; Fits 1980-1989 Plymouth Caravelle, N/A; Fits 1980-1989 Plymouth Gran Fury, N/A; Fits 1983-1987 Chrysler Fifth Avenue, N/A; Fits 1979-1983 Chrysler Cordoba, N/A; Fits 1981-1983 Chrysler Imperial, N/A; Fits 1980-1983 Dodge Mirada, N/A; Fits 1982-1983 Dodge W350, N/A; Fits 1981-1983 Plymouth PB150, N/A; Fits 1981-1983 Plymouth PB250, N/A; Fits 1981-1983 Plymouth PB350, N/A; Fits 1983 Plymouth Scamp, N/A; Fits 1979-1982 Chrysler New Yorker, N/A; Fits 1979-1981 Chrysler LeBaron, N/A; Fits 1979-1981 Chrysler Newport, N/A; Fits 1979-1981 Chrysler Town & Country, N/A; Fits 1980-1981 Dodge St. Regis, N/A; Fits 1980-1981 Plymouth Trailduster, N/A; Fits 1979-1980 Dodge Aspen, N/A; Fits 1979-1980 Dodge B100, N/A; Fits 1979-1980 Dodge B200, N/A; Fits 1980 Dodge B300, N/A; Fits 1980 Dodge CB300, N/A; Fits 1980 Dodge D200, N/A; Fits 1980 Dodge D300, N/A; Fits 1980 Dodge W200, N/A; Fits 1980 Dodge W300, N/A; Fits 1980 Plymouth PB100, N/A; Fits 1980 Plymouth PB200, N/A; Fits 1980 Plymouth PB300, N/A; Fits 1980 Plymouth Volare, N/A.

Common Problems This Part Addresses

• Starter motor engagement issues caused by damaged ring gear teeth
• Engine cranking problems from worn starter contact surfaces
• Noise during starting caused by chipped or broken teeth
• Intermittent no-start conditions related to ring gear wear
• Need for replacement after repeated starter engagement damage

Installation Notes and Tips

Verify tooth count, inside diameter, outside diameter, thickness, and flywheel pitch before installation. Confirm the application details against the transmission and flywheel specification, especially on vehicles with clutch-size notes in the fitment data. Proper alignment during installation is important to ensure smooth starter engagement.

Quality Assurance

ATP Parts designs this ring gear to fit and function like the original part for durability and long service life.