The TCI 399573 is a forged flexplate for pre-1986 Small Block Chevy and all Big Block Chevy engines. It is internally balanced with a 153-tooth ring gear and a small bolt pattern. The unit is SFI 29.1 approved. For an LS or GM large bolt pattern option at 11.5in, see part number 399754.
- Application: Pre-1986 SBC and all BBC engines
- Balance: Internal
- Ring gear: 153 tooth
- Bolt pattern: Small
- Construction: Forged
- Certification: SFI 29.1 approved
- Part number: 399573
FAQ
What engines does the TCI 399573 flexplate fit?
It is built for pre-1986 Small Block Chevy and all Big Block Chevy engines with an internally balanced rotating assembly.
How many teeth does the 399573 ring gear have?
It uses a 153-tooth ring gear with a small bolt pattern.
Is the 399573 SFI approved?
Yes. It is SFI 29.1 approved.

