ATP Parts Z-258 Automatic Transmission Flexplate

Reliable Automatic Transmission Flexplate for GM Vehicles

The ATP Parts Z-258 automatic transmission flexplate is engineered to meet the specifications required for a range of Buick, Chevrolet, Oldsmobile, and Pontiac models. Designed with precision, this flexplate ensures proper engagement between the engine and the transmission for smooth power transfer.

• Outside diameter: 11.938 inches
• Tooth quantity: 142 teeth
• Mounting hole diameter: 8.5 mm
• Diameter: 0.995 inches (25.27 mm)
• Pitch flywheels: 12
• Weight added: No
• SFI approved: No

Durable Design and Precise Specifications

The ATP Parts Z-258 flexplate is manufactured to exact dimensions, including an outside diameter of 11.938 inches and 142 teeth, which are critical for proper starter engagement and torque converter mounting. The 8.5 mm mounting hole diameter ensures compatibility with the specified GM models. This flexplate is designed without added weight and is not SFI certified, making it suitable for standard automatic transmission applications in vehicles such as the Chevrolet Impala, Pontiac Grand Prix, and Buick Regal.

Compatible Vehicles and Applications

This automatic transmission flexplate is compatible with a variety of GM makes and models, including:

• Buick Achieva, Century, Regal, Skylark
• Chevrolet Cavalier, Impala, Malibu, Monte Carlo
• Oldsmobile Cutlass, Cutlass Ciera, Cutlass Supreme
• Pontiac Grand Am, Grand Prix, Sunfire
• Additional models: Alero, Aztek, Corsica, Lumina, Lumina APV, Montana, Rendezvous, Silhouette, Trans Sport

Common Issues Addressed by the Flexplate

• Starter motor engagement problems due to worn or damaged teeth
• Transmission vibration caused by flexplate imbalance or damage
• Difficulty in torque converter mounting or alignment
• Flexplate cracks or warping from engine stress
• Noise or rattling from a compromised flexplate

Installation Notes and Tips

When installing the ATP Parts Z-258 flexplate, ensure the mounting surface is clean and free of debris. Verify the tooth count and mounting hole diameter match your vehicle’s specifications. Torque all bolts to manufacturer-recommended settings to avoid flexplate distortion. It is advisable to inspect the starter ring gear and torque converter for wear during installation.

Quality Assurance and Warranty

ATP Parts manufactures the Z-258 flexplate to meet industry standards for durability and fitment. While this flexplate is not SFI certified, it is designed for reliable performance in compatible GM automatic transmissions. Warranty details should be confirmed with the distributor or retailer at the time of purchase.