Flex plate nuts

Reply Subscribe

Thread Tools

Search this Thread

Oct 29, 2014 | 09:30 PM

1loco

Thread Starter

Junior User

Joined: Aug 2013

Posts: 75

Likes: 0

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

Lead Driver

Joined: Jul 2011

Posts: 8,679

Likes: 191

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

Lead Driver

Joined: Apr 2011

Posts: 6,399

Likes: 40

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

Ford Parts Specialist

Joined: Nov 2006

Posts: 88,826

Likes: 787

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

Hotshot

Joined: Mar 2013

Posts: 14,255

Likes: 199

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

Lead Driver

Joined: Jul 2011

Posts: 8,679

Likes: 191

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

Likes: 787

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.

Top 10 Fords at 2026 Carlisle Ford Nationals

Joe Kucinski

3 Best / 3 Worst Parts of Modern Ford Ownership

Brett Foote

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

Pouria Savadkouei

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

Oct 30, 2014 | 07:49 PM

NumberDummy

Ford Parts Specialist

Joined: Nov 2006

Posts: 88,826

Likes: 787

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

Logistics Pro

Joined: Jun 2003

Posts: 3,928

Likes: 276

As of yesterday, Galpin Ford has 4 less.

Oct 31, 2014 | 08:07 AM

#11

1loco

Thread Starter

Junior User

Joined: Aug 2013

Posts: 75

Likes: 0

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

Oct 31, 2014 | 09:32 AM

#12

351Cleveland C4

Lead Driver

Joined: Jul 2011

Posts: 8,679

Likes: 191

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

Likes: 0

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

Hotshot

Joined: Oct 2002

Posts: 18,488

Likes: 22

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.