390 flywheel thick/thin
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Mountain Pass
Joined: Feb 2006
Posts: 176
Likes: 13
390 flywheel thick/thin
Any one the spec on the thickness of a 390 flywheel, manual trans..?
s?comment
Also, my wheel seems to be a 1/4 or 1/2" larger dia than other flywheels for same engine family.
I thought they were all the same. I ran my 390 at Advance Auto parts and they list a different size than the (i thought was) standard 11".
Any comments?
s?comment
Also, my wheel seems to be a 1/4 or 1/2" larger dia than other flywheels for same engine family.
I thought they were all the same. I ran my 390 at Advance Auto parts and they list a different size than the (i thought was) standard 11".
Any comments?
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
The O.E. wheels had a blind hole in the clutch surface that disappeared when minimum thickness was reached. As for wheel size, FE's only had one I know of with two size pressure plates : 11" and 11.5" The 11.5 was on the 390 GT and 428CJ's. The flywheel itself was the same diameter for both.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
390 Cars 1965/71 / F100/350 1968/76 360 ~ 390 / 428 passenger car flywheels
C5AZ-6375-K .. Flywheel-360 ~ 184 tooth ring gear. 6 5/16" pressure plate attaching holes on 12 3/8" bolt circle.
C5AZ-6375-L .. Flywheel-390 ~ 184 tooth ring gear. 6 5/16" pressure plate attaching holes on 12 7/8" bolt circle
as original: 360's used an 11" clutch; 390's used an 11 1/2" clutch.
--------------------------------------------------------------------------
428 Flywheels
C6AZ-6375-A .. Flywheel-428 ~ 184 tooth ring gear. 14 23/64"-diameter. 6 5/16" pressure plate attaching holes on 12 7/8" bolt circle. Used on 1966/68 Ford and Ford Police Cruiser.
C8OZ-6375-A .. Flywheel-428 ~ 184 tooth ring gear. 14 15/64"-diameter. 6 5/16" pressure plate mounting holes on 12 7/8" bolt circle. Used on Torino/Mustang Cobra Jet.
C9ZZ-6375-A .. Flywheel-428 ~ 184 tooth ring gear. 14 15/64"-diameter. 6 5/16" pressure plate mounting holes on 12 7/8" bolt circle. Used on 1969/70 Torino/Mustang Super Cobra Jet.
The same ring gear = C5AZ-6384-A is used on all 352/360/390/428 manual flywheels.
C5AZ-6375-L .. Flywheel-390 ~ 184 tooth ring gear. 6 5/16" pressure plate attaching holes on 12 7/8" bolt circle
as original: 360's used an 11" clutch; 390's used an 11 1/2" clutch.
--------------------------------------------------------------------------
428 Flywheels
C6AZ-6375-A .. Flywheel-428 ~ 184 tooth ring gear. 14 23/64"-diameter. 6 5/16" pressure plate attaching holes on 12 7/8" bolt circle. Used on 1966/68 Ford and Ford Police Cruiser.
C8OZ-6375-A .. Flywheel-428 ~ 184 tooth ring gear. 14 15/64"-diameter. 6 5/16" pressure plate mounting holes on 12 7/8" bolt circle. Used on Torino/Mustang Cobra Jet.
C9ZZ-6375-A .. Flywheel-428 ~ 184 tooth ring gear. 14 15/64"-diameter. 6 5/16" pressure plate mounting holes on 12 7/8" bolt circle. Used on 1969/70 Torino/Mustang Super Cobra Jet.
The same ring gear = C5AZ-6384-A is used on all 352/360/390/428 manual flywheels.
Last edited by NumberDummy; Jul 1, 2007 at 05:50 PM.
Cargo Master
Joined: Apr 2004
Posts: 2,574
Likes: 4
From: Golden, CO
Now there's a mouthfull, thanks Bill!!!
Every now and again someone gets a ring gear that chews up a starter drive, it'd be nice to have this data bookmarked. Do you have a link to the pre-'65 flywheels and flex plates?
Every now and again someone gets a ring gear that chews up a starter drive, it'd be nice to have this data bookmarked. Do you have a link to the pre-'65 flywheels and flex plates?
Cargo Master
Joined: Feb 2004
Posts: 2,055
Likes: 167
From: Central Texas
Originally Posted by baddad457
The O.E. wheels had a blind hole in the clutch surface that disappeared when minimum thickness was reached.
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FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Originally Posted by Hypoid
Every now and again someone gets a ring gear that chews up a starter drive, it'd be nice to have this data bookmarked. Do you have a link to the pre-'65 flywheels and flex plates?
156? I still have one in the garage, I could always walk out there and count.
Bill, as always, good info! If you do find pre-65 stuff, I would be very interested in knowing if the FT was still the same course-teeth all the way up into the 70's...
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Postmaster
Joined: Jul 2003
Posts: 2,711
Likes: 2
From: Pittsburgh
For exact measurements on min thickness, i should be able to get it shortly. I have the spec book at home, I'm just not there right now.
Also, I just knocked a couple of teeth off of my ring gear and had to replace the flywheel on my 390. The two flywheel options i was given was for a 184 or a 188 tooth flywheel.
As for the other tooth counts, the 302, 351, and 300/240 use a 164 tooth flywheel in truck applications and IIRC a 157 in car applications.
Justin
Also, I just knocked a couple of teeth off of my ring gear and had to replace the flywheel on my 390. The two flywheel options i was given was for a 184 or a 188 tooth flywheel.
As for the other tooth counts, the 302, 351, and 300/240 use a 164 tooth flywheel in truck applications and IIRC a 157 in car applications.
Justin
Postmaster
Joined: Jul 2003
Posts: 2,711
Likes: 2
From: Pittsburgh
for the price of the ring gear, having the old one machined off (it was a one piece wheel), and having the wheel resurfaced (it needed it) I was better off to just spend the $60 on the flywheel. thing that really threw me was the core. the flywheel was 59.99 with a $125 core.
Justin
Justin
!["Beemer Nut"'s Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23bc5285' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>"</text></svg>)
Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
They are off their rocker asking $125 for core hell collect them from Pick-N-Pulls and make a deal with 'em.
Now if you had the motor assembly balanced before this replacement it could cause a shaker plus Ford did send many shakers out from the factory.
You might get lucky.
Now if you had the motor assembly balanced before this replacement it could cause a shaker plus Ford did send many shakers out from the factory.
You might get lucky.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Originally Posted by Beemer Nut
Throw in a 361/391 flywheel that is externally balanced, thicker, more mass plus ran a 12" clutch I recall.
C5TZ-6375-D .. FT Flywheel / 330 engine / 12" clutch / 188 tooth ring gear / 15" diameter / 6 15/16" pressure plate attaching bolts on 12 7/8" bolt circle.
330's also used a 13" clutch, as did the 361/391's. The flywheel with a 13' clutch is also 15" in diameter, but has a 14 1/8" bolt circle.
Hypoid: Prior to 1965, FE flywheels had 153 teeth. There were 3 (not counting HiPo's) 1958/64 FE flywheels.
Last edited by NumberDummy; Jul 5, 2007 at 03:25 AM.
Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
Numbers; many years ago I went thru this on a custom build.
First taking a FT flywheel and cut the OD down with a small shoulder
step as a stop for the ring gear to rest against. The finished flywheel was app .050" larger than the ring gear at room temp. New ring gear was cut away from a flexplate, heated and shrunk fit on the flywheel.
The flywheel is thicker so to keep the throwout arm angle correct the pivot must be lowered with the bell housing window cut back the same amount.
I recall this flywheel was almost 9 pounds heavier than a stock one, I built this back in 77 for a 410 powered 4x4.
It does fit after some machine work allowing for more low rpm 4x4 pulling.
First taking a FT flywheel and cut the OD down with a small shoulder
step as a stop for the ring gear to rest against. The finished flywheel was app .050" larger than the ring gear at room temp. New ring gear was cut away from a flexplate, heated and shrunk fit on the flywheel.
The flywheel is thicker so to keep the throwout arm angle correct the pivot must be lowered with the bell housing window cut back the same amount.
I recall this flywheel was almost 9 pounds heavier than a stock one, I built this back in 77 for a 410 powered 4x4.
It does fit after some machine work allowing for more low rpm 4x4 pulling.