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Unread 05-17-2013, 12:08 PM   #1
iluvcowjuice
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quick transmission swap question

I'm getting a 360 that was mated to a 727 auto transmission. I have a 304 now with a t176 Dana 300 combo ready to go on it. Do I need a new fly wheel on the motor or will everything bolt up?

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Unread 05-17-2013, 12:21 PM   #2
Matt1981CJ7
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AMC V8s are externally balanced, meaning each displacement size has it's own specific flywheel and balancer. They don't interchange.

The manual and auto flywheels are also different.

So, the answer is, yes, you will need a new flywheel for the 360/T18 combo.

Matt
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Unread 05-17-2013, 12:28 PM   #3
iluvcowjuice
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Awesome, thank you.
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Unread 05-17-2013, 12:32 PM   #4
78FordF150
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I will add to what Matt said just to clarify. You need a AMC 360 specific flywheel and harmonic dampner for a manual transmission that is for a 360.
You can not use the dampner from a automatic transmission.
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Unread 05-17-2013, 12:37 PM   #5
iluvcowjuice
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Ok. Does the dampner mount to the front or back, and is it something I can get at a parts store?
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Unread 05-17-2013, 12:49 PM   #6
CSP
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Wait, what?

I've been down this road before (a few times) and I've NEVER heard of a transmission type specific harmonic balancer. Sorry, but I'm not buying that one.

The flywheel and harmonic balancer (dampner) balance the engine's rotating assembly, not the transmission's.

The flywheel only has to change because an auto uses a flexplate, not a flywheel and a clutch isn't compatible with a flexplate. It has nothing to do with balancing.
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Unread 05-17-2013, 12:52 PM   #7
78FordF150
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Mounts to the front of the crankshaft. It is what your lower center pulley on the front of the engine bolts to.
You might be able to get one locally. Just have to try.
Have them look up a 78 jeep j10 truck with manual transmission.
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Unread 05-17-2013, 01:39 PM   #8
78FordF150
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My first 360 swap I did years ago, (came out of a Cherokee with automatic) had a slight vibration from idle on up into the rpm range. One of the old guy's at the time that worked at the jeep dealership told me it was because the dampner was for a automatic transmission. We went to the parts department and they listed one for each transmission. So I ordered one for a manual tranny and it curred my vibrations. The one I took off and the new were visibly different.

I just looked online and can't find one listed specifically for a certain tranny. Just going by past experience.
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