Southbend clutch in 07.5 6.7 and g56.

[07flatbed]

Recently lost the original dual mass clutch at 50K miles in my 07. 5 with the g56 6 speed. Dealer replaced the clutch and hydraulics with a Southbend OFE at my direction. Since then I have traveled to Arizona and am experiencing hard shifting and a noise that sounds like marbles rattling around with the engine idling, trans. in neutral. Sometimes I can push and release the clutch and the noise stops. I was told by someone that installs Southbends that the one in his truck does the same thing.



Anyone else experiencing the same symptoms with the southbend?

 

[NIsaacs]

The noise is normal for a Cummins equiped manual transmission, the dual mass clutch helps cancel the noise. Over time you will get used to it and not even notice it.



Nick

 

[zzman]

I have a single disk SB clutch as well. I don't recall it sounding any different than the stock one (dual mass).

Now the dual disk that I had in the 04 made plenty of rattling noise, did you get a dual disk??



I do have bearing noise that is coming from the transmission, more like whinning sounds. I'm pretty sure I will need new bearings soon.

My son's 08 still has the stock clutch but he doesn't really work his truck, all quiet with his.



Yep the dual disk sounds like marbles.



Just a thought, I would change the fluid and overfill 1 qt.

 

[SierraRam]

Normal, I have had those sounds since I installed 70,000 miles ago. I am getting ready to change my transmission fluid from the ATF-4+ to Mobil Delvac 50 synthetic transmission fluid after much research by members on this site and others.

The hard shifting is a little concerning, but I had to relearn how to drive my truck after the install of the SB clutch. I kinow it is harder to shift than stock but I am so used to it know I don't notice. The hardest gear for me to shift into has always been reverse, got to really pull it into gear.

 

[TLane]

...



The hardest gear for me to shift into has always been reverse, got to really pull it into gear.

Here's a section from the owner's manual that may help with shifting into reverse (if you haven't already read this part). I find it's true - you need a quick pull over to the left, then it will go into gear easily.



Reverse Shifting

To shift into REVERSE (R), bring the vehicle to a complete

stop. Depress the clutch and pause briefly to allow

the gear train to stop rotating. Beginning from the

NEUTRAL (N) position, move the shift lever in one quick

smooth motion straight across and into the REVERSE (R)

area (the driver will feel a firm “click” as the shifter

passes the “knock-over”). Complete the shift by pulling

the shift lever into REVERSE (R).

The “knock-over” prevents the driver from accidentally

entering the REVERSE (R) shift area and warns the driver

that they are about to shift the transmission into REVERSE

(R). Due to this feature, a slow shift to REVERSE

(R) can be perceived as a high shift effort.

To shift out of reverse bring the vehicle to a complete stop

and depress the clutch. Shifting out of reverse prior to a

complete stop may cause high shift effort.

 

[Regcabguy]

Normal, I have had those sounds since I installed 70,000 miles ago. I am getting ready to change my transmission fluid from the ATF-4+ to Mobil Delvac 50 synthetic transmission fluid after much research by members on this site and others.

The hard shifting is a little concerning, but I had to relearn how to drive my truck after the install of the SB clutch. I kinow it is harder to shift than stock but I am so used to it know I don't notice. The hardest gear for me to shift into has always been reverse, got to really pull it into gear.

I've got SBC's HD single and it's real nice. Clutch is silent,engagement pretty smooth and the transmission is quieter with Delvac than with the Pennsoil I had prior. Reverse goes right in with mine,but pulling it out of reverse requires engaging the clutch twice. It was the same with the dmf stocker. Ever transmission seems to have its own characteristics.