Georgio281

iTrader: (1)

Should I go ahead and buy poly transmission mounts too, while I'm at it? Will I experience tons of vibration when they're both installed, or is there really no downside? Thanks.

blk/slvr02ss

iTrader: (21)

I just put a poly tranny mount on my 02 SS and it has a vibration now.

Georgio281

iTrader: (1)

Is it unbearable, or just on takeoff?

Element

iTrader: (5)

With poly motor mounts, there's really no reason to buy a poly trans mount - just pick up a replacement OEM mount.

You could put a martini on my passenger seat and the vibrations would mix it up, but the transmitted gear whine and 2000rpm resonance is just too overwhelming.

4WOFURY

iTrader: (2)

When I did Poly motor mounts, I did the trans mount as well. Feels perfect to me.

Blu99T/A

iTrader: (5)

Same here.
The poly mounts will make it tough to line the motor up to the mounts again as the poly does not give much.

rob69zombie

iTrader: (7)

I have Poly motor mounts and a poly trans mount and have no vibrations to speak of. The only drawback from the tranny mount is it has a seperate bolt to put in the middle instead of being studded. Go with both man.

Georgio281

iTrader: (1)

Thanks for all the input, guys. Appreciate it. I'll be going with both when the time comes. I had to spend some cash on an oil catch can for the crappy PCV system because the damn thing likes to drink so much oil.

rob69zombie

iTrader: (7)

You can get the poly trans-mount from Advance auto as they usually keep them in stock and you can have them order the Prothane motor mounts too. Again, good luck.

TransAm_VS_VR-4

People say they cause "vibrations" well, somewhat. It's not a night and day difference, just think of your car idling a little lower and the vibrations are really not that bad... most of the times from my exhaust and sound system, I don't even notice it. Maybe when I'm stuck in traffic it'll catch my attention.

Blu99T/A

iTrader: (5)

agreed. You have to virtually be looking for the difference, then after awhile you forget what it was like with rubber mounts anyway.

Orange Juice

iTrader: (3)

I hated my poly motor mounts from the day that I installed them. the car "buzzed"

01ssreda4

iTrader: (96)

Don't buy the trans mount.

Snake_Skinner

iTrader: (12)

What trans mount did you have?

BlueSuperGoat

iTrader: (3)

So, what is the purpose of doing the motor and trans mounts? Sorry, I'm a dumb noob. I'm probabably going to be doing headers in the next couple of months and I keep reading that I should do motor mounts at the same time. Why? Whats the purpose? I'm not having any issues that I know of? And poly? solid? Wha?

Element

iTrader: (5)

Stock rubber mounts crack and tear, allowing the engine to rock side to side - which, aside from being annoying as hell (especially in bad traffic in an M6 car), causes less power to be transmitted to the wheels. I recently went with solid mounts, and even though my stock ones weren't too bad, the car feels much more solid now, and I don't get any annoying motor rock.

It's easiest to do the motor mounts when the headers are being changed, because of how tight it is to get to the mounts.

Poly mounts keep the stock engine pedestals, and replace the OEM mounts with harder, less flexible polyurethane mounts. Solid motor mounts replace the entire stock engine pedestal and directly connect the engine to the chassis - there's no bushing at all.

zachrywd_01TA

Your stock rubber motor mounts are probably cracked, broken and make the motor bounce all over the place. If you take the stock Y off and replace it you're more than likely going to hear the motor banging the Y pipe on the floor.

The Poly MM's are freakin tough, they'll keep the motor in line and in one place.

sjsingle1

iTrader: (1)

all poly and NO vibrations......replace the crappy stock PCV with a LS6 valley cover.....worth its weight in gold

BlackScreaminMachine

iTrader: (17)

When you start to really mod the car you notice how much the engine Torques if you rev the motor. I have been rolling on rubber (car under 50k miles) but recently did a TQ arm relocation kit and a Poly trans mount and there is some vibration, but eventually this winter the Poly needs to go on. Then re do the TQ ARM PINION ANGLE.

If you plan on modding the car it would not be a bad thing to do but if your plan on staying stock, go with factory replacement.