I had the same steering wheel shake I've read about in a number of other posts. There is no doubt it was coming from the mount.  In checking for possibilities I checked rotors, ujoints, carrier, etc.  When I got to the mount I pried on it, looking for some type of separation.  I never found anything suspect on any area, but when I started driving it again the severe shaking stopped.

 

Question is:  What does the mount do to the alignment of the tranny to the CV s to cause this?  The shaking would be fairly broad at lower speeds and shorten at higher speeds.  It made sense this was transferring something from the axles.

 

Thanks for the help.

shaking in the steering wheel stopped after prying on the trans mount?

 

has the shaking returned?

Yeah the shaking stopped after prying on the mount.  That's the only thing I really did anything with.  The rest of the stuff I just checked.

 

No, the shaking hasn't returned,  but I haven't driven it a lot of miles.  I have a Subie mount on order. 

If the whole trans can wiggle, all kinds of motion could result.

i got the new one today.  It shows the same part number, but this one is a little taller and only has two mounting bolts plus the center one.  I wonder if this is a modification to help the vibration problem.  It looks like it's about 1/4 inch taller in the rubbers.  The possibility is the old one had collapsed slightly.  It did look like the rubbers were pulling off the metal a little.

 

I'll get this thing is and see how it works.

 

Thanks for the responses.

Well, I swapped the transmission mounts and the steering wheel shake has stopped altogether.  Good for another 266,000 miles.

 

Thanks for all the responses

Nice find. Good job, that's good to know they look different so someone doesn't think it's the wrong part.

 

No obvious mount issues when the old one was removed?

No, it wasn't destroyed.  It has some deterioration at the rubber, as in cracking, but nothing separated.  It's interesting as to how it caused what it did. The smaller rubbers at the bottom were making contact, leading me to think the large outside cushions may have been a little collapsed.  I suspect this was the original and over due for replacing.

 

The wheel shaking just started about 10K ago, so no complaints about the Subie.  It's my main set of wheels here in Iowa. Does about everything for me.