clutch and flywheel problems
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Senior User
Joined: Jan 2006
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From: northwest Georgia
clutch and flywheel problems
I have a 460 i'm putting in an f150. I am bolting it to an np435 and am having a few problems. I got a flywheel from a 390 and although it bolts up okay, the clutch wont bolt to it. Its a 12" clutch and the bolt holes on it are spaced about 1/2" to far to bolt to it. Also, when i hold the clutch disk up to the flywheel, the springs on the clutch hit the flywheel bolts. Does this mean the flywheel has been machined too far and i need a new one? And do i need to get an 11" clutch instead of a 12" one? Thanks for any help.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
352/360/390 flywheel specs
Is it a 390 flywheel?
390's used an 11 1/2" clutch on a 12 7/8" bolt circle. The flywheel is marked: C5AE-6380-K
352/360's used an 11" clutch on a 12 3/8" bolt circle. The flywheel is marked: C5AE-6380-J
Both have (6) 5/16"-18 pressure plate attaching holes.
The 352/360 flywheel was used 1965/76 on F100/350's / The 390 flywheel was used 1968/76 on F100/350's.
Passenger cars with 352's from 1965 thru 1967 / Passenger cars with 390's from 1965 thru 1971.
390's used an 11 1/2" clutch on a 12 7/8" bolt circle. The flywheel is marked: C5AE-6380-K
352/360's used an 11" clutch on a 12 3/8" bolt circle. The flywheel is marked: C5AE-6380-J
Both have (6) 5/16"-18 pressure plate attaching holes.
The 352/360 flywheel was used 1965/76 on F100/350's / The 390 flywheel was used 1968/76 on F100/350's.
Passenger cars with 352's from 1965 thru 1967 / Passenger cars with 390's from 1965 thru 1971.
Elder User
Joined: Jul 1999
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From: Missouri
HOLD ON!!! You have to have the right balance flywheel. You can only use 460 flywheels on 79 and later motors. The 360 flywheel is correct for a pre 79 motor. I have always used a 460 starter with a 360 flywheel without any problems. I have two trucks now that are using this set-up. I have also drilled and tapped two 360 flywheels to take the bigger pressure plate.
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From: Missouri
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Postmaster
Joined: Apr 2003
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From: Virginia Beach
Very true. . .I have one, but it came with the 460 that was swapped in
BUT, he did say he was going to have to buy a 460 clutch and flywheel already. . .I just wanted someone else to reaffirm that he could indeed just buy a 429 flywheel and not have to worry about fit and operation.
Quick Google search shows they run roughly the same $$$ wise
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
HOLD ON!!! You have to have the right balance flywheel. You can only use 460 flywheels on 79 and later motors. The 360 flywheel is correct for a pre 79 motor. I have always used a 460 starter with a 360 flywheel without any problems. I have two trucks now that are using this set-up. I have also drilled and tapped two 360 flywheels to take the bigger pressure plate.
He didn't say, and the early 429/460 block was used thru 1978 on cars, thru midyear 1979 on F100/350's & E150/350's.
There is no serial number break, or production date listed, when Ford switched engine blocks midyear 1979...which has been a PITA ever since.
Bare block casting numbers:
Early: D1VE-6015-AB; AB1; AB2.
Late: D9TE-6015-AB.
429 flywheels are very hard to find and expensive if you do find one.
C9AZ-6375-A / Marked: C9AE-A / Fits: 1969/70 Ford & Fairlane/Torino (exc CJ/SCJ)
C9AZ-6375-C / Fits: 1969/70 Mustang Boss / 1970/71 Fairlane/Torino & Mustang CJ/SCJ.
Both of these have a 12 7/8" bolt circle / 176 tooth ring gear.
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Senior User
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From: northwest Georgia
My 460 is a 78 so it is the neutral balance type. I know i could just get a 360 clutch for it but i decided to get the 460 flywheel because of simplicity. Later on I wont have to remember what flywheel or what clutch or other parts i put on it. I just get a 460 complete setup and dont worry about it. Plus the new flywheel is only $50. I'd rather spend the extra right now and have a new or refurbished flywheel as opposed to the used one i have now. I just hope they send me the right flywheel. The website said it will fit early 70s, mid and late 70s and even early 80s vehicles which i know is wrong because of the switch to external balance in 79. so we'll see.
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