little_chewy_69

iTrader: (2)

Just to be clear i have no suspension mods at all even oem motor mounts. Ever since i put a polyurethane transmission mount in a few years back the vibrations have been pretty bad and i was wondering is there anything i can do to reduce it. Will solid motor mounts make it worse or better, will torque arm relocation brackets and a better torque arm help also? What can i do to reduce the vibrations? Plz let me know your opinions.

therabidweasel

iTrader: (5)

Switch back to an oe trans mount. Rubber motor mounts and a poly trans mount is about the worst thing you can do...but poly motor and rubber trans is fine.

Solid anything will make vibes worse. Id only go solid if I needed to fit a huge engine in a small car where theres no room for movement.

mikh338

iTrader: (16)

yeah once you put a poly trans mount in its gona vibrate like a ****. wish i had left my stock rubber trans mount in but i didnt know at the time and did it with my poly motor mounts etc...

BMR Tech2

iTrader: (5)

Go back to rubber and your problem will be solved. The introduction of polyurethane into the cars bushing/isolation system will typically result in some form of increased noise or harshness. If you can accept the performance benefits as a trade off, then they're not too bad.

Go back to rubber and DO NOT go solid. You will be much more annoyed by that.

- Kevin

z28bryan

iTrader: (7)

I have poly transmission mount. I'm pretty picky and it's not that bad.

little_chewy_69

iTrader: (2)

Well i don't know maybe there is an under-lying problem.... at first i thought something had to be out of balance for the vibrations i get. You can see the center console moving it shakes so bad at certain speeds. There are only two sweet spots 67 and 77 i think maybe off a bit on those but 2-3 MPH out of them its terrible again maybe i need to look at my drive line...?

Also some people are saying go back to the rubber trans mount but I'm 440RWHP and going to be putting 150 shot on and few upgrades this spring so is a rubber mount gonna take 600RWHP with a set of nittos 255's at the moment but going wider.

unioncarpenter84

iTrader: (22)

ive got the same problem i got the same trans mount swapped it for a rubber it shakes bad at 70 mph the whole console cant figure it out

eteller

Remove the preload plate and grind down the two poly "bumps" on the mount. Your problems will be solved. My car was unusable after I installed a ES poly mount a few weeks ago. It's taller and changed the driveline angles enough to throw everything out of whack. I removed the plate that comes with it and ground of the humps on the mount, I can't tell a difference between it and a stock mount now.

speed_demon24

iTrader: (6)

I had to go back to a rubber mount in my car, but with my dad's car you can't even tell it has a poly trans mount. No vibrations at all at any speed.

z28bryan

iTrader: (7)

Can the effects vary between cars? Because my car feels fine. Maybe I just got lucky? It's noisier and vibrates a little more with my heads/cam, but I just assumed that came with the upgrade.

dr_whigham

iTrader: (49)

Prothane here and I love mine.

James Martin

I bet it's your driveshaft. Ask me how i know

sjsingle1

iTrader: (1)

holy 7 yr old thread revival batman

2JAWZ

iTrader: (1)

When this happened to me years ago I chased a lot of things. Thought pinion angles were off, turns out it was a busted poly trans mount. Switched back to stock rubber and all was well lol

blackbyrd

iTrader: (14)

had a similar issue on my GTO (yikes 7 yer old thread but hey 2 lincolns) i found when my motor mounts were in bade shape so I swapped them to poly as well that helped my issue.

basically the tranny was more rigid but the oe was so soft it made the issue worse.