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rubber of poly trans mount?

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Old Aug 17, 2017 | 12:34 AM
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Default rubber of poly trans mount?

About to order up a trans mount for my 69 4 speed.
Any advantage/disadvantage to poly vs rubber?

Thanks
Glenn in San Diego
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Old Aug 17, 2017 | 08:37 AM
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I replaced my original rubber mount with an Energy Suspension poly mount along with their poly motor mounts. Don't notice any difference between rubber and poly.
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Old Aug 17, 2017 | 10:38 AM
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I was told to use the rubber mount in this location to avoid the vibration transmitted through the harder poly.
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Old Aug 17, 2017 | 01:38 PM
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Poly is not solid so it will isolate vibrations like mine do. You will hear more negative comments on poly vs rubber. I have poly bushings throughout my car and don't have any complaints whatsoever. So, pick your poison, lol.
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Old Aug 17, 2017 | 03:00 PM
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Poly motor, trans rubber has to be some give somewhere in the system so you dont break parts.
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Old Aug 17, 2017 | 06:06 PM
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Originally Posted by cuisinartvette
Poly motor, trans rubber has to be some give somewhere in the system so you dont break parts.
The problem I ran into was the aftermarket rubber mounts have a threaded insert pressed into the metal bar that is vulcanized into the mount. These used to a metal bar that was threaded. Long story short the insert came loose as I was tightening the bolt down. I had a hell of a time getting the bolt back out and the mount back out. So I went with the energy suspension mount. I cannot tell the difference.

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Old Aug 17, 2017 | 06:58 PM
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My 75 Vert had solid motor mounts with a poly trans mount when I bought it. I can't say I felt anymore vibration than normal.

I'm putting a new poly mount on the trans and reusing the solid motor mounts. Front end is all poly and I'm using poly body bushings as well.

Mike
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