Transmission Noise LNF GMPP
 

Alright guys, I'll try to explain my issue as best as I can.

Last year I bought a LSJ GMPP clutch for my LNF. I got it installed and the technician noticed that the holes around the pressure plate were a bit bigger than the holes around the flywheel (where the bolts go). He said a little bit of noise could appear. The flywheel was fine and did not need resurfacing. Its a 2010 Cobalt SS TC with 39K.

A couple months after, I would say 3 months, I stared hearing a little rattling sound coming from the transmission. I noticed when going into a drive-thru, it echoed with the walls. It could have started before but I didnt notice it with the music playing etc.

When I press the pedal clutch, the noise goes away. When I release it, it will sometime do it again, and sometimes stop until I press it again and let go. There is definitely something a bit loose in there but before I bring it to a mechanic, I would like to know what you think.

I made some research and it could be the input shaft bearing or the throw-out bearing. It could also simply be the clutch not aligned 100%.

Nothing changed performance wise and it shift smoothly as usual.

Could the pressure plate holes of the GMPP clutch being a bit bigger than the flywheel holes be the culprit? It's not a grinding noise, but rather a regular "tic tic tic" coming from the tranny.

Thanks for your help!

The TOB bearing is going bad.
Drive it until it breaks.


My car does this. The TOB has mere 5,000 miles on it.

Yeah my TOB has about the same mileage. It sucks though since it's still almost new.

However I watched videos online and my sound is a regular tick tick that goes away when I press the clutch. Ive seen videos of bad TOBs and it sounds more like an irregular clunk.

There is a debate between TOB failure and input shaft bearing failure. Any other insights?

Yea. That it's the TOB. Like I Said; been there and driving it anyways.

I have an LSJ but I get the same noise. I wouldn't be too worried about it.

Alright thanks for the input guys. I'll just drive it until it's time to change my clutch again. Not worth spending another 6-8 hours of labor for that issue.