304 flex plate on a 258? - JeepForum.com
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Unread 12-08-2011, 03:24 PM   #1
Oldcraneguy
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304 flex plate on a 258?

I know the 360 and 401 flywheels/flexplates are weighted but Im thinking I read somewhere that the 304 wasnt and could be used on 6 cyls, anyone know if this is true? or was I just dreaming....thanks....OCG

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Unread 12-08-2011, 04:08 PM   #2
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Just dreaming. All of the AMC V8's are externally balanced and the 6cyls are internally balanced. The 6cyl flywheel has to be neutral balanced and the 304 won't be that way.
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Unread 12-08-2011, 04:40 PM   #3
mopar408
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^^^^^^^^what he sez.
But, since you are going from "weighted" to "unweighted', they may, may use a neutral-balanced wheel like a six needs and then balance it from there. And that would ONLY be on an automatic ('flex plate" is the term).
If it is an auto and appears symmetrical with the exception of some form of weight attached/welded/whatever
you could cut it off and use it on a six.
304 flywheel has a small (1" x 2"? ) weight CAST into the backside. I6 has 3 ribs cast 120 degrees apart.
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Unread 12-08-2011, 04:58 PM   #4
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Oh well, I found a 304/727/300 for a buddy of mine who is building a 258 and wants the auto, guess he'll just have to buy a flexplate unless this ones got a weight I can cut off....thanks for the info....OCG
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Unread 12-09-2011, 08:03 AM   #5
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Any '80-86 CJ with an auto and 258 would be right application for the flexplate that the 727 needs. Those years came with the TF904 or TF999, but they use the same flexplate as the 727.
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Unread 12-09-2011, 08:06 AM   #6
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Quote:
Originally Posted by mopar408 View Post
I6 has 3 ribs cast 120 degrees apart.
That's just one variant. There's a six-rib casting, also.
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