The TCI 399603 is a Premium Series flexplate that replaces stock GM Small Block Chevy 400 externally balanced units. It carries a 10.75in bolt pattern with a 168-tooth ring gear and is spin balanced for vibration-free operation. A premium corrosion-resistant finish helps it outlast common budget flexplates, making it a durable upgrade for stock to mild performance vehicles.
- Series: TCI Premium Series
- Application: GM Small Block Chevy 400, external balance
- Ring gear: 168 tooth
- Bolt pattern: 10.75in
- Balance: Spin balanced
- Finish: Corrosion-resistant premium finish
- Part number: 399603
FAQ
What does the TCI 399603 Premium Series flexplate replace?
It replaces stock GM Small Block Chevy 400 externally balanced flexplates.
What is the bolt pattern and tooth count on the 399603?
It uses a 10.75in bolt pattern with a 168-tooth ring gear.
Is the 399603 balanced?
Yes. It is spin balanced for vibration-free operation on both internally and externally balanced engines.

