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Go Back   Dodge Cummins Diesel Forum > 07.5 - 09 6.7 Liter Cummins > 07.5 - 09 3rd Gen 6.7L Powertrain
07.5 - 09 3rd Gen 6.7L Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine, Transmission, etc...NO ADVERTISING

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Old 05-30-2010, 09:00 AM   #1 (permalink)
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G56 Gear Rollover

Recently installed Southbend Dual Disc.
Now the gear rollover from the tranny is horrible..
I drained and filled the tranny with 7qts RP Syncromax.
It is definitely quieter when the oil is cold.
I'm wondering if draining & adding a quart of Hy-Per Oil Supplement would hurt anything? I'm wanting to increase the viscosity a smidge.
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Old 05-30-2010, 09:42 AM   #2 (permalink)
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From what I read I think it's the nature of DD clutches to produce more gear noise. There's a good article part way down here:http://www.techcapri.com/PDF/Repair/...ice_S08-00.pdf

It doesn't sound like there's much that can be done.
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Old 05-30-2010, 10:20 AM   #3 (permalink)
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A fluidamper should help some to if the oil does not get it quiet . I have one plus added lucas tranmmison addttive ,noise is almost completly gone.
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Old 05-30-2010, 10:47 AM   #4 (permalink)
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Quote:
Originally Posted by 700kenny View Post
A fluidamper should help some to if the oil does not get it quiet . I have one plus added lucas tranmmison addttive ,noise is almost completly gone.
Do you have a 5.9 or 6.7? From what I understand, fluid damper can help the 5.9 but is of no value to 6.7 as it already has one. I'm a 6.7

But I'm willing to try about anything - even returning to stock at this point.
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Last edited by trophytime; 05-30-2010 at 10:51 AM.
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Old 05-30-2010, 01:59 PM   #5 (permalink)
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Any thoughts on a durable aftermarket DMF? I bet SBC or ATS could come up with something quiet for those of us not running huge HP and routinely towing an office building over the Rockies. Anyone have pics of the stock DMF? Was it almost falling apart when it came out? I'm certainly no expert but a more robust DMF with a single disc clutch that could handle a bit more HP than stock seems like it'd be a good seller.
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Old 05-30-2010, 02:31 PM   #6 (permalink)
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Stronger DMF?

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Originally Posted by Tractortug View Post
Any thoughts on a durable aftermarket DMF? I bet SBC or ATS could come up with something quiet for those of us not running huge HP and routinely towing an office building over the Rockies. Anyone have pics of the stock DMF? Was it almost falling apart when it came out? I'm certainly no expert but a more robust DMF with a single disc clutch that could handle a bit more HP than stock seems like it'd be a good seller.
I spoke to a LUK rep about just that subject. He was a DMF- equipped Dodge owner and acknowledged a market exists for a DMF with maybe 50-100 hp over stock. He said he'd bring it up with the engineers and marketing. Maybe a few more e-mails would help. The SBC OFE is supposed to be nearly stock like in noise and manners. I keep my Smarty@ sw#3 and luckily I inherited the lower final drive. 285-75-17's a constant 2000# load and no slippage yet.
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Old 05-31-2010, 06:51 PM   #7 (permalink)
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Quote:
Originally Posted by trophytime View Post
do you have a 5.9 or 6.7? From what i understand, fluid damper can help the 5.9 but is of no value to 6.7 as it already has one. I'm a 6.7

but i'm willing to try about anything - even returning to stock at this point.
5.9.........................
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Old 05-31-2010, 10:56 PM   #8 (permalink)
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Quote:
Originally Posted by Danderson View Post
I spoke to a LUK rep about just that subject. He was a DMF- equipped Dodge owner and acknowledged a market exists for a DMF with maybe 50-100 hp over stock. He said he'd bring it up with the engineers and marketing. Maybe a few more e-mails would help. The SBC OFE is supposed to be nearly stock like in noise and manners. I keep my Smarty@ sw#3 and luckily I inherited the lower final drive. 285-75-17's a constant 2000# load and no slippage yet.
I sure agree. Who is LUK?
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Old 05-31-2010, 11:01 PM   #9 (permalink)
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I sure agree. Who is LUK?
LUK manufacturers our stock dmf.
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Old 12-27-2013, 11:22 AM   #10 (permalink)
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I just got with Dan at valair clutches and they offer the new quiet series. ill be getting mine installed tomorow so i can leave feedback after break in.
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Old 12-27-2013, 05:52 PM   #11 (permalink)
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The quiet one is in regards to floater plate rattle, the floater when clutch pushed in is silent, gear rollover is a entirely different issue, while we as well as others have made progress, it cannot be ruled out when changing over from a dual mass to single mass flywheel. I also assume we are installing yours in the morning?
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Old 12-28-2013, 01:17 PM   #12 (permalink)
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gear rollover is the nature of the beast when changing from dmf to a smf. if you don't lug it you wont hear it. me I kinda like the sound.
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