Transmission mount 727... Poly vs. Rubber?

[Scooter]

Have a lil interior vibration left over after replacing the u-joints a week or so back. Prior owner installed a poly transmission bushing and I'm thinking it might be the culprit. Anyone on-board have real world experience going to or from rubber/poly and picking up additional seat of your pantelones vibrations?

[1 Wild R/T]

I run a poly mount with no vibration issues... I had a vibration, till I corrected the pinion angle....

[7212Mopar]

Changed from broken worn rubber to poly mount and no vibration.

[Scooter]

^^^ Thanks both. Thinking some of it might be from the poly-lock motor mount on the driver side as well.

[Chryco Psycho]

Could be a number of things like trans rear bushing worn , driveshaft angle , bad U joint .
the mount will not create a vibration but you might feel it more with poly .

[BigSig 6 Barrel]

Could be a number of things like trans rear bushing worn , driveshaft angle , bad U joint .
the mount will not create a vibration but you might feel it more with poly .

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For sure C/P . . .  I see this all the time in the motorcycle world . . . and I'm not saying that's the case here, but so many people focus on fixing the "symptoms", not realizing that they still haven't addressed the root "problem".

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[HP2]

Agree its not the mount but poly could make it more noticeable.

I've never used a poly trans mount and have always preferred rubber. The  tail shaft on a transmission isn't exactly the strongest thing, so I have always used rubber to allow it to flex some if needed.

[anlauto]

I was always told you shouldn't mix rubber (engine) mounts with Poly (transmission) mounts....same with suspension, you should never mix the two 

[Scooter]

The drivers side motor mount is a poly lock.. passenger is regular rubber. Switching that one motor mount to rubber took quite a bit of vibration down, the new u-joints near eliminated it. Wondering if what's left is "normal" but highlighted by the stiffer mount(s)? Transmission was rebuilt some time back and has maybe 10k miles on it.