Well it seems as though I've ripped the hub out of the clutch on the NV4500 in my 93. bummer. I'm looking into getting a south bend, partially because they seem to be the Goerend equivalent for rowing and partially because my local Brown's Diesel shop sells them and stands behind them.

Question is, from what I can gather, a dual disc is excellent for towing with some power upgrades but is too stiff for daily driving. I'd say my truck is used 70/30 for daily driving/heavy towing. I've got some minor power upgrades, slightly tweaked pump, 60hp injectors and would like to upgrade the turbo (Brown's told me my stock clutch wouldn't really handle the injectors and would definitely not hold up to injectors and turbo...and here I am...)

so what's your preference on dual vs single for a city driver/heavy towing. oh and I have 3.55 gears and 305/70's so everything's a bit harder on the clutch.

 

get a double and just forget about it no need to mess with a single...


if your not sled pulling a south bend DD 3250 would be perfect i would say, i think that is one of the ones that you dont need to upgrade your hydros so your pedal wouldnt be as hard for driving around the city...

 

SB TRIPLE DISK FTW!!!!!! go big or go home.....

 

I can't afford to make enough power to justify a triple disc!

On the dual setup what's the difference between upgraded hydraulics vs stock?

 

you would want a tripple to drive on the road anyway, slep pulls only for the tripple

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the stock hydros are to week to handle the pressure of the dual disk cover, you can use the hydros off a 98-02 with the 5600, better than buying them new

 

If you can swing it I would def go double disk. I went single and now wishing I had went double.

 

i burnt a single out in 4 months went to the dual now it works like its supposed to

 

I found out that my local shop Brown's Diesel sells Valair, too, for what that's worth.

What all is involved with upgrading the hydraulics and is it costly? Roughly how much more is a dual disc over a single (just the clutch, not including the hydro swap)?

I'm really kind of torn on the dual/single as I'm not making a ton of power and it's also my daily driver. I'm a pretty good size guy so a heavy clutch pedal wouldn't be the worst thing to deal with but...the roughly 20-30% of time I spend towing is typically around 6-8k trailer weight, with an exhaust brake.

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dang it, there's not much I can validly argue against a couple of you guys saying your singles burnt up pretty quick...

 

As with anything, What are your horsepower goals? You don't want to buy a too small clutch now then have to upgrade later.

Highest ratings I've seen for a single disc is about 550 hp. However the engagement on a single disc is going to be a lot rougher than on a DD with the same hp rating. Speed of shifting seems to depend on the vehicle however a couple things I have learned.

Usually a diagphram style pressure plate will shift faster than a lever style.
A DD with 6 pucks per disk usually shifts faster than one with 12.

I have a 3250 lever style with 12 puck solid hub disks. and it shifts SLOW! But I also have a 5600 and I think my floater plate is warped.

I couldn't tell the difference in pedal pressure between this and the LUK I had before.

 

I don't plan to go past 300-ish hp with this truck. I've got 60hp injectors, a minor pump tweak, studs and would like something like a 62/14, nothing crazy, maybe some water/meth for hauling up a grade.

I'm aware of the bug that you always want more power but I'd rather get another truck with a P-pump or CR to make more than a measly 300-350-ish(which is not a laughable amount, just relatively reserved!). I got this one for hauling trailers, mountain fire road access for camping/cabin trips and it kinda ended up being my daily driver, too.