I just installed a map short block w/deleted balance shaft and competition stage 3.5 ceramic segmented with act lightweight flywheel. I never had any drive train noise before the install. Trans and transfer case were silent. Now if I'm in 3rd gear I get this loud rattle from 3500-3000 rpm when I'm decelerating roughly around 40 mph to about 35mph. It doesn't do it free revving only in gear and decelerating. And only in a little window of rpm/mph. I have even put it up on jack stands and tried driving it in the air with my buddy under it, but it doesn't make the sound. Has to be on the ground. If I make it make the rattling sound and give it the slightest amount of gas it goes away. I have Checked for loose exhaust, cut and filed every thing that that would be rubbing, rubber taped every metal on metal that I couldn't cut or file. There are other threads out there that I have read that when upgrading clutch and flywheel this happens but people say it shouldn't. I posted in there threads but have got no reply. So I'm making my own. It's driving me crazy, it's the coffee grinder sound. It's not t case whine.

Please any advice would greatly help.

Is this common????


The rattle begins at 0:08 and ends at 0:12 it's only In That Rpm range on deceleration.
It's starting to bug the hell out of me!!! Please help

This just started happening after the clutch and lightweight flywheel Install.

 

Some help me!

 

I could not hear it. But dose it sound like a coffee grinder? If so I think its the clutch. I have an ACT 6 puck solid hub and it chatters like hell. I wont be making that mistake again.

 

Contact MAP?

 

The motor is smooth and shuts smoothly. Yes it's the coffee grinder sound.

 

Is your sound only on decel???

 

Let me guess that you are running an unsprung disc on your clutch.

 

Yep and ya can kinda hear it in neutral with out the clutch peddle pressed.

 

Mine is sprung. But competition says it can 150% more torque than stock.

 

Could the stiffer spring on center hub just be that strong?

Any clutch gurus???

 

Any more input?