The TCI 399173 is a forged flexplate for Chevrolet LT-1 engines. It is externally balanced and carries a 153-tooth ring gear with a small bolt pattern. The unit is SFI 29.1 approved and suits stock to mild performance builds. An internally balanced version is offered under part number 399174.
- Application: Chevrolet LT-1 engines
- Balance: External
- Ring gear: 153 tooth
- Bolt pattern: Small
- Construction: Forged
- Certification: SFI 29.1 approved
- Part number: 399173
FAQ
What engine does the TCI 399173 flexplate fit?
It is built for Chevrolet LT-1 engines with an externally balanced rotating assembly.
Is the 399173 flexplate internally or externally balanced?
It is externally balanced. For an internally balanced LT-1 option, see part number 399174.
How many teeth does the 399173 ring gear have?
The ring gear has 153 teeth and uses the small bolt pattern.

