The TCI 399754 is a machined flexplate for GM LS series engines including the 4.8, 5.3, 5.7, and 6.0. It is internally balanced with a 168-tooth ring gear and an 11.1in wide bolt circle. The unit is SFI 29.1 approved. For the LS or GM small bolt pattern at 10.75in, see part number 399753.
- Application: GM LS 4.8, 5.3, 5.7 and 6.0 engines
- Balance: Internal
- Ring gear: 168 tooth
- Bolt circle: 11.1in wide
- Construction: Machined
- Certification: SFI 29.1 approved
- Part number: 399754
FAQ
Which engines does the TCI 399754 flexplate fit?
It fits GM LS series engines including the 4.8, 5.3, 5.7, and 6.0.
What bolt circle does the 399754 use?
It uses an 11.1in wide bolt circle with a 168-tooth ring gear.
How does the 399754 differ from the 399753?
The 399754 uses the wide bolt circle, while the 399753 uses the 10.75in small bolt pattern.

