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Old 05-14-2006, 10:58 PM
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Diaphram vs Borg & Beck

I'm replacing the clutch and pressure plate on my 78 chevy K20 pickup. There seems to be a lot of options for replacement clutch kits and I'm not sure which is best suited for my application. The clutch I'm taking out is the original 12" borg & beck style clutch with a mechanical linkage. It's a sm465 tranny with np205 transfer case. This truck is a daily driver but is used for towing, hauling, and 4x4. I would like a heavier duty clutch but it doesn't need to be super crazy because this isn't a really high performance machine (mild small block).

First question: can a diaphram clutch be a direct replacement if a borg & beck is coming out? Is there anything else that needs to be changed? Basically, are they interchangeable?

Second question: is there any advantage to a diaphram clutch? I've read borg & beck have higher pedal pressures. That isn't much a concern to me. I don't mind a reasonably heavy pedal especially if it means the clutch has decent holding force.

Thanks for any help,
dh

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Old 05-14-2006, 11:48 PM
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Often there are direct replacements.

A diaphram clutch holds tighter as the disc wears compared to the BB which has less clamping pressure as the disc wears. (coil springs get longer= less force exerted)

A diaphram clutch has less pedal pressure for the disc clamping pressure.

and as the pedal is depressed the diaphram takes less leg pressure, where as the BB continues to need more and more.
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Old 05-15-2006, 08:54 AM
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Either will work fine. Back in the day, we used to order ours up with stiffer springs. Problem was we kept breaking the long rod ends on the linkage piece that went through the floor! LOL

Which ever you choose, just make sure they give you the correct T/O bearing for it. The diaphram takes a cone faced bearing, the B&B takes a flat faced bearing.

Mark
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Old 05-15-2006, 01:17 PM
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I just got through doing a clutch replacement in my Handyman Wagon.

It took me a couple years to find a suitable replacement cause the buddy I bought the Wagon from, hodge podged the car to get it on the streets.

He used a 1970+ Muncie long tail 4-speed with a used 10.5 Borg N Beck clutch set up behind the 350 he stuck in the Wagon.

In 2004 I tried like all get out to get a new clutch set up in the stock '57 bellhousing. After two tries with new set ups purchased from NAPA, I finally gave up and stuck the old clutch back in so I could drive the Wagon again.

Just so happens I purchased a new 10.5 RAM diaphram clutch set up at Summit in february that went right in? It's weird cause now the clutch grabs big time compared to the used Borg N Beck I took out.
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Old 05-15-2006, 02:05 PM
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Back in the day when I was really into drag and street racing the only clutch I could find that would work was the B&B. We had a local clutch re builder build us up some special pressure plates and never had a problem. A diaphram clutch would stay on the floor when doing a power shift at 7 grand....not a good thing.

Vince
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Old 05-15-2006, 06:06 PM
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Thanks for the replies. It seems like either would be fine for what I need it for. I think I'm going to get a heavy duty diaphram style. I'll let you know how it turns out.
dh
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Old 05-15-2006, 08:59 PM
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Look at a centerforce I think its a II .one in my sons vette. Stock pedal feel.Put 28 runs on it at the track in one day still works like new,Doug
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