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Engine/Transmission (1994 - 1998) SouthBend SDD3250 - Installed

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Engine/Transmission (1998.5 - 2002) COMP BOX~and Fault Codes 2000 5.9L

2nd Gen Non-Engine/Transmission 1st Gen to 2nd Gen axle swap?

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JKosten

TDR MEMBER
I put this clutch in a few weeks ago and now have about 1500 miles on it.

I want to first say that I seen the write ups in TDR and when it came down to selecting between Southbend and Valair, the final deciding point was the noise reduction and chatter. I have a good freind, who is also a member, who has a southbend DD, but he has the billet flywheel and is SFI certified. Why he has that one is a long story and involves a valet destroying his factory clutch in one night, but I digress. The other factor was with a 96 truck and the smaller input shaft on my NV4500 I wanted to not have to pull the transmission twice because I snapped the input.

So I ended up installing the Southbend SDD3250 with 1. 375" input shaft, transmission overhaul (bearing, synchros and seals) new updated main shaft with new style 5th retaining nut, transfer reseal, new starter,, rear main and the two oil plugs above it.

The entire job from start to finish including hot tanking the cases and steam cleaning the parts took about 25-30 hours, but I did not want to rush it.

The main reason I am writing this to report on the drive-ability of the SDD3250. After I got it all back together with the help of my fiend, he jumped in the cab to check the pedal to make sure it was disengaging properly. At first he thought we did not put it together right as the pedal was soft and smooth, unlike his truck which is like going to the gym. We then started the truck and could feel the clutch engage and disengage, but we could NOT hear the typical rattle that is connected to the center plate of a double disk truck. That noise is how I know when his truck is at my house.

After driving it for over two weeks to include a 1k road trip to LA and back, i am very happy I chose this clutch. It holds whatever I throw at it and will bark tires in 1st, 2nd and 3rd. To anyone else that drives it, they did not know is was a DD until I told them and if I had not put it in myself it I would not know either.

So what it all boils down to: If you are looking at the different high performance clutches and do not plan on sled pulling (not SFI certified) and want a great daily driver clutch that can still handle higher horse power and torque, consider the SouthBend SDD2350.

And please ask me any questions about this clutch or the job to R/I it.
 
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Did you have to upgrade the factory master and slave? What is peddle effort like compare to stock? What is the shifting like? How hard or easy to upshift, same with downshifting? I really would like to know how it compares to a con ofe.
 
Okay great question: According to Southbend, the 12v trucks had a "heavy" hydraulic system from the factory. Dodge was using a 12-1/4" clutch with a 3200lb pressure plate. When they switched to the 24v truck and were building more power, the trucks got a 13" clutch and a 3000lb pressure plate to make the drivability nicer.

The pedal effort now is about the same or lighter. I feel that it is more consistent throughout travel.

The shifting is normal for a NV4500. With the new syncros the transmission takes a little longer to match gears, but before I was having to rev match my self of bump a lower gear to get the shaft speeds to match up. My friend who had a 2wd 12v with the NV4500 drove it and said it felt that same as his truck on shifting.

I have no idea how it compares to the Con OFE, as I went from a LUK oem replacement, that was burned into a nice rainbow color to the DD.

The best way I can describe it that it feels and sounds like a stock clutch, but handles the engine power modifications. I also noticed that in first at an idle, it will stall the engine if the clutch is dropped.
 
We then started the truck and could feel the clutch engage and disengage, but we could hear the typical rattle that is connected to the center plate of a double disk truck. That noise is how I know when his truck is at my house.



You mean CONNOT hear the centerplate?



Well anyways im the freind that helped him and I was blown away with how quiet and smooth this clutch is, really want one in mine now!
 
You mean CONNOT hear the centerplate?



Well anyways im the freind that helped him and I was blown away with how quiet and smooth this clutch is, really want one in mine now!
I think that's the way I'll go. I watched a video on one of these sites and the new 3250 seemed indeed as quiet as the stocker.



I ran into a local guy with one of the original 3250 DD's. I had driven it three years ago. That sucker would drive me nuts with all the racket. I wonder now,who's got the most miles on one of the new ones and is it still quiet and smooth? Will the pucks eventually wear out and you're stuck with another transmission with gravel in it?
 
I am not sure, I know Southbend has a warranty against defects like a dampener failing as long as a certified installer puts it in.
 
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