Is it normal to feel a lot more vibration once installing the poly trans mount? And since it was installed i feel more of a vibration near the trans around 2500 rpm.




99 Camaro SS A4 80,900 miles- magnaflow cat-back, trans-go shift kit, sfc's, strut brace, lid, 3:73's (QTP headers and y-pipe with tune in a couple weeks)

 

If the vibration started when you changed the mount, then you answered your question...

Yes, it's a stiffer mount, so more will be felt.. Better to be ONE with the car, Daniel Son.

 

Yes it's normal, mine does it too you'll get used to it after a while.

 

Yeah, you will fell more vibration. Some people switch back to OEM for that reason. From what I have gathered, if you replace the motor mounts with poly as well, it lessens the vibrations.

 

This is not an engine tech question. Moving it to the appropriate forum.

 

Did you switch out to urethane engine mounts too? If you did not,
then be very cautious, because the OEM rubber motor mounts allow the
engine to flex; however, the urethane tranny mount will not flex and
there is a possibility that the tailshaft housing will crack. I've read
where this has happened to folks when changing ONLY the tranny
mount to urethane (and not doing the engine mounts at the same time).

 

ya its the mount. I had one and took it out after a week. This dam car has enough vibs, rattles, etc.
Personally i hate poly bushings and think rubber ones will do almost as good of a job. Plus they actually flex, which is needed.

 

How much does it cost to swith the engine mounts to poly as well?

 

The mounts themselves only cost around 50 bucks.

 

Around how much would it be for installation? Is it a pain in the *** job?

 

It is kind of a pita job. I would guess a few hours of labor at whatever the labor rate, so probably a few hundred bucks.

 

There are many people running poly tranny mounts, without switching to poly motor mounts. I have not seen much in the way of tranny tailshaft housings cracking. I've had the same ES poly mount behind my 800HP nitrous motor, with stock motor mounts for 8 years..... no cracks in the tailshaft housing. If it was a real problem, I think there would have been numerous reports of failures, given the fact that there are probably thousands of people on this site alone who have used a poly tranny mount with the stock motor mounts.

 

I also have two slightly bent rims on the passenger side which are getting replaced with new ones so hopefully that takes some vibration away.

 

I switched out my engine mounts to urethane in about an hour's time. The
urethane mounts are MUCH larger than the OEM rubber - the poly's
fit the complete interior of the clamshell casing (the OEM rubber does not).

 

I do a lot of highway driving and around 80 was when mine would vibrate. Then again my driveshaft is also not balanced right so the poly made that worse for me. come on LS1 driveshaft!