Flex plate nuts

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Oct 29, 2014 | 09:30 PM

1loco

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Flex plate nuts

I have 1972 F100 with a 390 and a C-6. Can anybody tell me size/thread of the nuts and which are the best to use?

Oct 29, 2014 | 09:47 PM

351Cleveland C4

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From: On the Edge of the Desert

You mean the torque converter stud nuts? I think they are 3/8-24. Use shoulder nuts

Oct 29, 2014 | 10:18 PM

ultraranger

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From: El Dorado, Arkansas

Quote:

Originally Posted by 351Cleveland C4

You mean the torque converter stud nuts? I think they are 3/8-24. Use shoulder nuts

Yep. 3/8"-24 prevailing torque flanged lock nuts.

Should look something like this.

http://image.made-in-china.com/2f0j0...Flange-Nut.jpg

Oct 30, 2014 | 09:21 AM

NumberDummy

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From: Simi Valley, CA

Quote:

Originally Posted by 1loco

I have 1972 F100 with a 390 and a C-6. Can anybody tell me size/thread of the nuts and which are the best to use?

378941-S441 (replaced 378941-S8 & 378941-S78) .. Lock Nut-Converter to Flexplate - 3/8" -24 / Available from Ford.

FX/FMX/MX Cruise-O-Matic - C3/C4/C5/C6 - AOD/E4OD.

Since you live in AZ:

SAN TAN FORD in Gilbert AZ has 7 = 480-821-3200.

CAMELBACK FORD in Phoenix AZ has 8 = 866-613-1789.

EARNHARDT FORD in Chandler AZ has 20 = 480-893-0000.

HOLMES TUTTLE FORD in Tucson AZ has 25 = 520-292-3723.

DON SANDERSON FORD in Glendale AZ has 36 = 623-842-8643.

Your local dealer (if not one of the above) will probably also have them.

Oct 30, 2014 | 02:29 PM

JEFFFAFA

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Joined: Mar 2013

Posts: 14,255

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From: Phoenix, Az.

Quote:

Originally Posted by NumberDummy

HEY. WHAT AM I,BREAD PUDDING?
Berge Ford...Mesa,az. ....has 23...480-497-7662.

Oct 30, 2014 | 03:19 PM

351Cleveland C4

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From: On the Edge of the Desert

Where is OP? That will tell you where to get them.

Oct 30, 2014 | 05:40 PM

NumberDummy

Ford Parts Specialist

Joined: Nov 2006

Posts: 88,826

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From: Simi Valley, CA

^ The OP is in AZ, so I only listed these sources. ^

Quote:

Originally Posted by JEFFFAFA

HEY. WHAT AM I,BREAD PUDDING?
Berge Ford...Mesa,az. ....has 23...480-497-7662.

I would have listed many more AZ dealers, but I couldn't. I'm using the D2D courtesy of a P/M pal of mine in WA

D2D only lists 50 sources, there are so many dealers listed in CA/ID/OR/WA that have these nuts, that there are no AZ listings.

The AZ dealers I did list, came from PartsVoice.

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Oct 30, 2014 | 07:49 PM

NumberDummy

Ford Parts Specialist

Joined: Nov 2006

Posts: 88,826

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From: Simi Valley, CA

Quote:

Originally Posted by 351Cleveland C4

I meant where in AZ? It's sorta a big state.

I dunno, OP just sez AZ in his "About Me" profile.

Oct 30, 2014 | 09:19 PM

#10

BobbyFord

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Joined: Jun 2003

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As of yesterday, Galpin Ford has 4 less.

Oct 31, 2014 | 08:07 AM

#11

1loco

Thread Starter

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Thank you very much guys. BTW I'm in the city of Maricopa.

Oct 31, 2014 | 09:32 AM

#12

351Cleveland C4

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From: On the Edge of the Desert

Well howdy loco, your just down the road from me. I'm in chandler at the loop 202 and kyrene.

Nov 1, 2014 | 09:46 AM

#13

rews2

Senior User

Joined: Jun 2005

Posts: 364

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From: Las Vegas, NV

Is it possible to see these nuts from under the truck? My reason is because I saw a post, don't remember where, that the nuts if the wrong ones could be rubbing/scrapping as the engine is turning. I read in the post they had a rubbing type of sound similar to what I have. I haven't found anything visible on the engine while turning that could be causing it.

Nov 1, 2014 | 09:58 AM

#14

Ford_Six

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Joined: Oct 2002

Posts: 18,488

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From: The Big, Oregon

Where the bell housing bolts to the engine there is a cover plate. The nuts are right inside this, on the front side of the flexplate. The factory ones are a low profile and have a crimp on the outer side to ensure a positive lock on the studs. Do not replace with hardware store nuts or nylock nuts, the nylon retainer will melt with torque converter heat if it's worked hard.