Do I need to replace my #4 engine (trans) mount?

[Swenny]

I replaced the #3 mount a few months ago. I still get vibrations around the 60mph area and it seems to pull to the left. The updated TSB says to look at the #4 mount for vibration issues. I decided for kicks to take out the battery and battery box and take a look at it. Seems OK to me? Any way to determine if it is bad or not?

 

[Swenny]

Took a video last night. Not sure if this is excessive play or not?

I should note this was in Drive, with the parking brake on, and reving the engine

 

[Bluesideup]

Here are pictures of my transmission mount when it went bad. I had a lot of vibration in drive stopped at stoplights.

I looks like yours is pillowing out around the sides as it has collapsed. The sides should be straight like the new one I installed.

 

[Swenny]

Thanks a ton Blue! Incredibly helpful

Do you remember if you used an aftermarket one or one of the OEM ones?

 

[Bluesideup]

The failed one you see is aftermarket from Rockauto. It had just under 60k on it in this picture and was much much worse than the OEM one I pulled out at 80k. I replaced it with a new one from my local dealership as they had the same price as an online OEM Mazda parts retailer I found.

 

[Swenny]

So I finally did this 11 days ago. I'm at 67k miles

I used this video as a guide: http://youtu.be/_66rKoR5Bk0

Here's some pics of mine. Not nearly as bad as I thought

It did help with the idle vibration. $70 after shipping from Tasca Auto