ATP Parts Z-128 Automatic Transmission Flexplate

ATP Parts Z-128 Flexplate for Automatic Transmissions

ATP Parts Z-128 is an automatic transmission flexplate built for vehicles that use a 168-tooth ring gear and a 14.125-inch outside diameter. It connects the engine to the torque converter and starter, making correct tooth count and bolt pattern critical for proper operation in Chevrolet and GMC truck and car applications.

Key Features

• Part number: Z-128
• 168 teeth for starter engagement
• 14.125-inch outside diameter
• Inside diameter: 2.483 inches
• Mounting hole diameter: 11.5
• Weight added: yes
• High-quality steel construction
• Correct bolt hole spacing and ring gear teeth to match the original part

Detailed Description

The ATP Parts Z-128 flexplate is made for automatic transmission applications where the flexplate must handle repeated expansion and contraction as engine speed changes. Over time, cracked or sheared flexplates can create serious drivetrain damage, so replacement with the correct specification matters. This flexplate uses the proper 168-tooth count and OE-style dimensions to support reliable starter engagement and torque converter connection in compatible Chevrolet C10, C20, K30, P30, and GMC C3500 applications, along with additional classic GM truck and passenger car fitments.

This part cross-references Pioneer Automotive Industries FRA-141 and Standard Ignition V506 for the same application.

Common Problems This Part Addresses

• Cracked flexplate from repeated engine load cycles
• Sheared flexplate around the crank or converter mounting area
• Starter engagement issues caused by worn or damaged ring gear teeth
• Torque converter connection problems from incorrect bolt spacing
• Noise or drivetrain damage linked to a failing flexplate

Installation Notes and Tips

• Verify 168 teeth and 14.125-inch outer diameter before installation.
• Confirm the torque converter bolt pattern matches the application.
• Inspect the starter drive and ring gear teeth during replacement.
• Check for cracks, warpage, or elongation at the mounting holes on the removed part.
• Use the vehicle notes for special high-performance, police package, or THM-specific applications where listed.

Quality Assurance

ATP Parts manufactures this flexplate from high-quality steel with OE-style bolt hole spacing and ring gear tooth geometry for long service life and durability.