68 302 shakes badly at idle after T5 swap - Mustang Evolution

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Old 05-13-2010, 11:58 AM   #1
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68 302 shakes badly at idle after T5 swap

Ok I have a 68 302 in a 80 Mustang did a T5 swap from a auto. After finally getting everything I need and finishing it when I start it it shake something horrible at idle (between 800-1100rpms) After that it runs smooth as can be all the way through each gear.

My first thought was balance since I changed out the flywheel. I need a 28oz fly for a 68 so I picked up a fly from a 63 fairlane 289. THAT'S ALSO 28OZ RIGHT? To double check I took a look at the flex plate casting #'s got a C5AE which I believe is a 65 generic full size ford. ALSO A 28oz RIGHT?

What can it be? after 1100rpm its smooth all the way to 5500rpm haven't gone any higher don't see the need to.


Help! Having problem after problem.
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Old 05-14-2010, 10:06 AM   #2
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Re: 68 302 shakes badly at idle after T5 swap

Wow you guys around here are on top of your game! I have worked a whole day fixed it and worked another half day and still no reply from you guys damn.

I think your working too hard on how the site looks than helping people.
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Old 05-14-2010, 10:21 AM   #3
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Re: 68 302 shakes badly at idle after T5 swap

you obviously didn't put in to much time on the site did you?

the people here are extremely friendly, knowledgeable, & helpful.

oh, and most of them HAVE JOBS! i saw your thread, but i'm not experienced in that area to help you any.

glad you solved your problem, but if you do expect some help around here the attitude won't help you much.

starting with a newbie thread might've helped. introduce yourself and your car then post a thread about your problem. too many people come post a problem then take off without contributing back to the site in any way, which is where i see this going as well.
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Old 05-14-2010, 01:20 PM   #4
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Re: 68 302 shakes badly at idle after T5 swap

Well what did it end up being?

Sorry..been sick...work...no internet at work, etc. Some of us have other things going on.
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Old 05-14-2010, 01:24 PM   #5
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Re: 68 302 shakes badly at idle after T5 swap

lol yea i realize that just givin some ****.

Vacuum leak. There was a vac hose running from the manifold to the old FMX tranny. I forgot to plug it. Dumbass me.
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Old 05-14-2010, 01:57 PM   #6
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Re: 68 302 shakes badly at idle after T5 swap

glad it was something simple.
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Old 05-14-2010, 07:33 PM   #7
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Re: 68 302 shakes badly at idle after T5 swap

Well that was an easy fix, First thought was balance also, but that wouldn't really smooth out as revs went up!

The '80 shell is pretty light, isn't it? How's it run?
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