The TCI 399755 is a machined flexplate for GM 6.2L LS9 engines with a 9-bolt crankshaft. It is internally balanced with a 168-tooth ring gear and offers both 11.1in LS and 10.75in small GM bolt patterns. The unit is SFI 29.1 approved. A TCI special build torque converter is required to run it with 4L80E transmissions.
- Application: GM 6.2L LS9, 9-bolt crank
- Balance: Internal
- Ring gear: 168 tooth
- Bolt patterns: 11.1in LS and 10.75in small GM
- Construction: Machined
- Certification: SFI 29.1 approved
- Note: TCI special build torque converter required for 4L80E
- Part number: 399755
FAQ
What engine does the TCI 399755 flexplate fit?
It is built for GM 6.2L LS9 engines with a 9-bolt crankshaft.
What bolt patterns does the 399755 provide?
It provides both an 11.1in LS pattern and a 10.75in small GM pattern with a 168-tooth ring gear.
Can the 399755 be used with a 4L80E transmission?
Yes, but a TCI special build torque converter is required to fit 4L80E transmissions.

