Which Way Does a Flexplate Go On?

Published by Dustin Babich on

For automotive enthusiasts and DIY mechanics working on vehicle transmissions or engine assemblies, understanding the correct installation orientation of a flexplate is crucial. The flexplate, an essential component in vehicles with automatic transmissions, connects the engine’s crankshaft to the torque converter. This guide will navigate you through the importance of proper flexplate installation and how to ensure it’s done correctly.

Short Answer: The flexplate should be installed with the flat side facing the engine block and the side with a slight convexity or raised center facing the transmission or torque converter. This orientation ensures proper alignment and functionality of the transmission system. However, specific vehicles may have unique designs, so consulting the vehicle’s service manual is always recommended.


The flexplate serves as a critical link in transmitting engine power to the automatic transmission. Its proper installation is not just a matter of fit; it influences the entire vehicle’s performance, including the transmission’s smooth operation and the starter motor’s engagement. Incorrect installation can lead to significant mechanical issues, making it imperative to understand the correct orientation for installation.

Key Takeaways:

  • Proper orientation of the flexplate is essential for vehicle performance and transmission health.
  • Typically, the flexplate installs with the flat side toward the engine and the raised side toward the transmission.
  • Always refer to the vehicle’s service manual for specific instructions, as variations exist among different models and makes.
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Ensuring Correct Flexplate Orientation

Flexplates typically have one side that is completely flat, which should face the engine block, ensuring a flush fit against the crankshaft flange. The opposite side usually has a slight convexity or a raised section around the bolt holes, designed to face the transmission or torque converter.

Bolt Pattern Alignment

The bolt pattern on the flexplate is designed to align in only one orientation. If the flexplate doesn’t seem to fit or the bolt holes don’t align properly, it’s a clear indication that the orientation may be incorrect.

Torque Converter Clearance

The raised side of the flexplate provides the necessary clearance for the torque converter and other transmission components. Installing the flexplate backward can lead to interference and misalignment issues.

The Importance of Correct Flexplate Installation

Installing the flexplate in the correct orientation is vital for several reasons:

  • Transmission Health: Proper alignment prevents undue stress on the transmission’s input shaft and bearings.
  • Starter Engagement: The flexplate’s ring gear must align correctly with the starter motor to ensure reliable starting.
  • Vibration Reduction: Correct installation minimizes imbalance and vibration, protecting the engine and transmission from premature wear.


The flexplate is more than just a piece of metal connecting the engine to the transmission; it’s a finely tuned component that must be installed with precision. Remembering the general rule of thumb—flat side towards the engine, raised side towards the transmission—can guide you through the process. However, given the variations in vehicle designs, always consult the specific vehicle’s service manual to confirm the correct orientation for your flexplate installation.

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Frequently Asked Questions

Q: Can I install a flexplate without professional help?

A: If you have experience and confidence in working with engine and transmission components, you can install a flexplate. However, due to the precision required, seeking professional assistance is advisable if you’re unsure.

Q: How do I know if my flexplate is installed incorrectly?

A: Signs of incorrect installation include difficulty in starting the engine, unusual vibrations, or noises coming from the transmission area.

Q: Are all flexplates the same?

A: No, flexplates vary in size, bolt patterns, and design, depending on the make, model, and specifications of the vehicle’s engine and transmission.

Q: What happens if the flexplate is installed backward?

A: Incorrect installation can lead to a range of problems, from misalignment and imbalance issues to potential damage to the transmission and starter motor.

Q: Do manual transmissions have flexplates?

A: No, manual transmissions use a flywheel instead of a flexplate. The flywheel is a heavier component that provides the necessary inertia for manual transmission operation and also houses the clutch assembly.

Dustin Babich
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Dustin Babich

Dustin Babich

As the passionate author behind Automotivesimple.com, Dustin Babich is a knowledgeable expert in all things automotive. With a deep understanding of car tools, equipment, engines, and troubleshooting techniques, Dustin Babich shares invaluable insights, practical tips, and effective solutions to empower readers in overcoming car-related challenges.

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