The TCI 399753 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 small bolt circle. The unit is SFI 29.1 approved. It will not work with 4L80E transmissions.
- Application: GM LS 4.8, 5.3, 5.7 and 6.0 engines
- Balance: Internal
- Ring gear: 168 tooth
- Bolt circle: 11.1in small
- Construction: Machined
- Certification: SFI 29.1 approved
- Note: Not compatible with 4L80E transmissions
- Part number: 399753
FAQ
Which engines does the TCI 399753 flexplate fit?
It fits GM LS series engines including the 4.8, 5.3, 5.7, and 6.0.
What bolt circle does the 399753 use?
It uses an 11.1in small bolt circle with a 168-tooth ring gear.
Can the 399753 be used with a 4L80E transmission?
No. This flexplate will not work with 4L80E transmissions.

