So I recently took my 07 automatic tl in for inspection and was told two of the motor mounts were bad. I took it back home and decided to do it myself. It ended up being the front and side as im sure most of you couldve guessed. Trying to save a few bucks I ended up ordering all three from rockauto assuming that the rear was on its way out too. Well I put them in and in drive i get a real bad vibration that wasnt there with the old worn out mounts. Ive tried the whole neutralizing the mounts a few times and I cant get it to go away. The mounts are made by Beck Arnly and have the hydraulic and vacuum lines on them. Thats why I thought theyd be fine. Should I bite the bullet and order new OEM ones or does anyone have any other suggestions? The car idles fine and theres no issues in reverse either. Car has about 128xxx on it fyi.

 

Beck Arnley doesn't make motor mounts. They buy from random manufacturers and package under their own name.
Check your installation of them.
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After market one usually doesn't have the proper compound rubber as OEM mounts which explain why the abnormal vibration. Not all rubber create equal and just like car tires and this is the same thing apply for motor mount.

 

Get an OEM rear and the vibrations in the cabin should subside if you don't want to get all OEM mounts.

 

OEM ftw!

Just noticed my tranny side mount is cracked.

 

That was a good explanation!

 

Yeah I've had two RLs now. My old one had both mounts break and on my new one the right mount was broken. I sold the old RL but I fixed the new one's right engine mount. I took it to a local mechanic but they used the dealer part.

 

Get OEM rear and the vibration will be gone.

 

If the aftermarket ones are stiffer and therefore stronger than OEM, they may last longer but also with added vibration.. But I am only guessing! I have no idea about the compounds they use.
But it seems to make sense that the softer , more compliant, more flexbile OEM mounts may feel smoother but they break too. But I dont have any scientific proof the non-oem ones last longer.
It would be great to have the best of both worlds.