New Clutch, no more Dual Mass Flywheel, strange noises?

[Sean Flanagan]

I finally upgraded my clutch with a south bend OFE with a solid flywheel and upgraded hydraulics



Now that the squishy Dual Mass Flywheel is gone, I get a lot of strange growling noises from my G56.

The growling is worst below 1800rpm, especially in 5th gear.



Also, it is noisy at idle in neutral. It almost sounds like a rough bearing. If I push in the clutch it is nice and quiet.



First of all, are these sounds normal?



Second, will the hammering hurt my transmission? Does anybody out there have this setup for a while?



Thanks,



Sean

 

[Motorhead]

First of all the noise is normal.
I also have done the same clutch in mine and I don't lug it as much any more. Lugging it is harder on the bearings and gears. The DMF set-up absorbed the diesel "pulses" at low RPM.
I am assuming you have a later 3rd gen with the G56.

 

[sag2]

I have one sitting in the garage that was installed and the owner hated the noise so much he reinstalled the dual mass. As with everything there are always trade off's to consider. The dual mass may not be the strongest clutch, but they did a really nice job of tuning out the noises for the average customer. The noises you are hearing are perfectly normal for the performance clutch you have.

 

[HBarlow]

You are hearing the reasons why Dodge engineers installed the dual mass flywheel/clutch assembly when they moved to G-56 transmissions.

The Gen II trucks with NV-5600 transmissions prior to HPCR engines were much noisier and masked some of the driveline noises.

 

[Regcabguy]

I'm milking my DMF. The transmission is as quiet as my old Honda. I just wish SBC or Valair would produce a HD DMF unit for those of us who want a quiet interior and don't pump up the horses much.

 

[HBarlow]

The choice between a smooth and quiet but short-life dual mass flywheel and clutch assembly or an aftermarket conversion was the reason I ordered my Dodge with the Aisin six speed automatic.

 

[Regcabguy]

Yeah,that Aisen's a no brainer. I drove a 48 re on a 2006 and knew I was looking at a $4500+ transmission upgrade to bring it up to my '98. 5 DTT standard. I'll just keep milking this sucker.

 

[RVTRKN]

I'm sure everyone here knows my opinion on the Auto, no matter what make or model. But I'll take the noise over the DMF when its time for me to change out my clutch, I guess it will sound just like my NV5600 then.

 

[Regcabguy]

I can live with the NV5600 noise. I've driven three of them. You just have to watch the lug factor. It's the neutral idle clatter that I can't handle.

 

[JBonpua]

Insulate It

I Still have the DMF and milking it. Once it gives up its soul a SBC DD will take its place. I know there will be more clutch/trans noise. I've insulated the heck out on the entire cab and used ATP valve cover and oil pan blanket. It is now as quiet as a luxury car. :-laf

 

[abrankod]

If you want to SERIOUSLY reduce any gear rattle at low RPM after removing the DMF, you need to get a Fluidampr. I recently added one to my 07 which has a 3250DD , and it COMPLETELY changed the personality of the truck. I felt like a whole new low rpm powerband had been opened up to me!

-Dan

 

[seafish]

I have never heard this before.

Where does the fluidamper fit or mount?

Does SBC make or sell one?

TIA

 

[flyby night]

what years have the dual mass?

 

[Mishkaya]

I have never heard this before.

Where does the fluidamper fit or mount?

Does SBC make or sell one?

TIA

Fluidampr is a harmonic balancer. It does help reduce vibration for sure.

Cummins® Performance Dampers by Fluidampr®

 

[Mishkaya]

what years have the dual mass?

Anything after '05 when they switched to the G56 AFAIK.

 

[macdaddy]

You are hearing the reasons why Dodge engineers installed the dual mass flywheel/clutch assembly when they moved to G-56 transmissions.



The Gen II trucks with NV-5600 transmissions prior to HPCR engines were much noisier and masked some of the driveline noises.

HB



I know the 2nd gen gear lash was noticeable, but at least the engine would drown some of it out. Mine has a nice growl. Kinda dont mind it at all really.



Mac

 

[HBarlow]

HB

I know the 2nd gen gear lash was noticeable, but at least the engine would drown some of it out. Mine has a nice growl. Kinda dont mind it at all really.

Mac

I didn't mind the rattle in second or third gear when accelerating from low rpm in my old '01 with NV-5600 either.

Except for the long days of travel listening to the sound system over the engine sounds which left my ears hurting for a few hours I preferred the diesel engine sounds of the Gen IIs.

 

[RHestand]

I installed a Fluidamper in my 06, 2500, about a year previous to installing my new SBC, single disc. /solid flywheel, etc. , package. Consequently, I can't comment on how much it helped with the noise factor.

I can say this, "It was still pretty darn noisey, esp. at idle, (N. with clutch out) and at low RPMs pulling in 5th gear. And yes, if needed, I would still definately, install one again. "

IMO, sometimes with a superior high perf. product, "You can't have your cake and eat it too. "

Yes, the stock D-M flywheel/clutch set-up are nice and smooth, and absorbs a lot of the harmonic vibrations/noise. But, the down side is, IMO, even with a stock engine, they are marginal at best. Add any significant H. P. /torque upgrades, and they are junk.

Ray

 

[SShafranko]

I just received from UPS a street 3250. I'm thinking about installing it myself tomorrow. I have installed several clutches before all on performance cars. Is there anything special about this install i should worry about? I guess i'll do some research now.

 

[HBarlow]

I installed a Fluidamper in my 06, 2500, about a year previous to installing my new SBC, single disc. /solid flywheel, etc. , package. Consequently, I can't comment on how much it helped with the noise factor.
I can say this, "It was still pretty darn noisey, esp. at idle, (N. with clutch out) and at low RPMs pulling in 5th gear. And yes, if needed, I would still definately, install one again. "
IMO, sometimes with a superior high perf. product, "You can't have your cake and eat it too. "
Yes, the stock D-M flywheel/clutch set-up are nice and smooth, and absorbs a lot of the harmonic vibrations/noise. But, the down side is, IMO, even with a stock engine, they are marginal at best. Add any significant H. P. /torque upgrades, and they are junk.
Ray

Your post makes a lot of sense. Anyone considering the trade off of vibration and noise for a reliable clutch system should weigh the points you made.