TKX Post Swap RPM Related Vibration

[1970DCH]

I completed my TKX swap (I will post a more thorough write up in due time with my experience) but I have an RPM related vibration. I’m hoping someone here might have some input before I pull the transmission out to inspect the rotating assemblies. Basically, I have a vibration that gets worse the higher up the RPM I go. It is NOT speed related and in fact, very smooth at all speeds at lower RPM, ruling out driveshaft issues or pinion angle issues.

Has anyone experienced this using a kit from SST? My engine is an internally balanced engine and the related parts are correctly 0 balance for my application. I’m kicking myself to not have checked the parts, but instructions did not mention that I needed to do this.

Is there a way I can test/ rule things out?
- I’ve confirmed that nothing is hitting anywhere.
- I’ve confirmed that it is not speed related, but RPM related.
- I had triple checked my runout calculation
- I had triple checked that my pilot bearing was seated properly.
- everything torqued properly.
- no issues with installing the transmission to the bell housing.
- my engine is firing on all cylinders.
- there is no clutch slippage or juddering.

- Am I just dealing with a faulty flywheel/ pressure plate, most likely? I’m pretty disappointed to have to pull it all out at this point…

 

[PurpleBeeper]

It sure sounds like your flywheel/pressure plate isn’t balanced

 

[furious70]

Was the engine running without issue with a different transmission?

 

[1970DCH]

Was the engine running without issue with a different transmission?

Yes; it had a 904 and there was no vibration at all.

 

[1 Wild R/T]

If it is in the flywheel/clutch you should be able to duplicate it sitting still... Trans in neutral bring the engine RPM's up... Does it vibrate?

Everything in the trans spins except the output shaft.... The input, the counter shaft, all the speed gears... Everything... Along with the clutch & flywheel...