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Old 08-17-2020, 02:24 PM   #1
petehoovie
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Default Pressure Plate

Wondering which is the superior design....9" '34 Sedan - Street

#1



or #2

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Old 08-17-2020, 02:48 PM   #2
third_edition
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Default Re: Pressure Plate

I ordered a replacement clutch from RAM and they sent me a three finger design (like number two). I believe the original clutches were three finger design, but I can't say that for sure.

The three finger design uses the centrifical force of the spinning clutch to add pressure to the pressure plate - as the engine speeds up, it pushes down harder (you can see the weights in your picture).

My upgraded engine will use a diaphragm style of clutch (sort of like your picture #1, but with fingers all the way around). Apparently they are easier on your left leg.
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Old 08-17-2020, 03:14 PM   #3
Bob C
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Default Re: Pressure Plate

Won't it depend on which flywheel you have?
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Old 08-17-2020, 03:17 PM   #4
19Fordy
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Default Re: Pressure Plate

Never saw one like #1.
Stick with #2.
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Old 08-17-2020, 03:39 PM   #5
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Default Re: Pressure Plate

#1's started with 29 A's, went thru 34. 28 A's were the multi disk things the early racer's liked
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Old 08-18-2020, 02:36 PM   #6
petehoovie
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Default Re: Pressure Plate

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I think I found my answer at the Fort Wayne Clutch website.

#1 is for a RECESSED / STEPPED FLYWHEEL

#2 is for a FLAT, NON-RECESSED STYLE FLYWHEEL
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The only thing nice about being imperfect is the joy it brings to others....

"Silver rings, your butt! Them's washers!"
"We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969

https://www.youtube.com/watch?v=7NReUd2_0u0

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Old 08-18-2020, 03:47 PM   #7
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Default Re: Pressure Plate

Quote:
Originally Posted by petehoovie View Post
I think I found my answer at the Fort Wayne Clutch website.

#1 is for a RECESSED / STEPPED FLYWHEEL

#2 is for a FLAT, NON-RECESSED STYLE FLYWHEEL
That is correct. Ideally do to design, weight and force needed to actuate the clutch the #2 in your photos (35-up design) would be ideal. But if your 34 has the original flywheel it will take the other.
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Old 08-18-2020, 04:31 PM   #8
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Default Re: Pressure Plate

Thanks for your reply, Mike. I won't know what flywheel I have until I pull the tranny - my flywheel could have been replace sometime in the past. I'm thinking that if I do have an original recessed/stepped flywheel, I would be better off replacing it with a flat non-recessed style. Am I correct in assuming the original flywheel is strictly for a 9 inch clutch and that the 35-up flywheel will accommodate a 10-10 1/2 inch clutch?

Do you sell a kit that includes the 10-10 1/2 inch flywheel with ring gear, clutch disc and pressure plate?
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The only thing nice about being imperfect is the joy it brings to others....

"Silver rings, your butt! Them's washers!"
"We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969

https://www.youtube.com/watch?v=7NReUd2_0u0
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Old 08-18-2020, 04:54 PM   #9
Terry,OH
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Default Re: Pressure Plate

The Long style applies more pressure to the clutch plate as RPM increases due to the fly weights, it is a much better pressure plate than the Borg Beck.
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Old 08-18-2020, 05:28 PM   #10
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Default Re: Pressure Plate

Quote:
Originally Posted by petehoovie View Post
Thanks for your reply, Mike. I won't know what flywheel I have until I pull the tranny - my flywheel could have been replace sometime in the past. I'm thinking that if I do have an original recessed/stepped flywheel, I would be better off replacing it with a flat non-recessed style. Am I correct in assuming the original flywheel is strictly for a 9 inch clutch and that the 35-up flywheel will accommodate a 10-10 1/2 inch clutch?

Do you sell a kit that includes the 10-10 1/2 inch flywheel with ring gear, clutch disc and pressure plate?
The 48 prefix flywheel only works on 9” clutches and will not accommodate a 10” etc without drilling it. With a stock 34 trans case you can only use a 9” 35 and later type anyways.
We sell clutch kits but in terms of flywheels, all I would have are used ones

Last edited by 35fordtn; 08-18-2020 at 08:13 PM.
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Old 08-18-2020, 07:26 PM   #11
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Default Re: Pressure Plate

Today I removed the clutch from my 1934 ton and a half truck. It has the Borg & Beck style with 6 fingers (#1). The plate measures 10". Green book tells me this was truck only as is the flywheel. I haven't looked for a replacement as yet. I
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