Just installed Polyurethane tranny mount AND car is shaking now

[Slow5.0]

I always have vibrations 4500rpms and up ,my friend who is Mustang mechanic tell me he had same problem and when he change tranny mount vibrations gone so I try same but I bought Polyurethane tranny mount from Summit Racing and installed hour ago, when I start Stang after installation 1300-6000rpms are there , I installed right and put everything back together just like before, meybe it's because mount is hard and can't play like stock one

 

[wytstang]

That is normal I installed the prothane polyurethane motor and tranny and the vibration is there at all RPM's. Its kind annoying put it's livable for me.

 

[95snoozer]

yeha, it is suposed to do that.

I would put a stock soft one in there for a strete car

 

[95GTvert[bv12]]

i had this problem till i got poly motor mounts no there is a bit of a vibration but not bad at all

 

[Slow5.0]

yeha, it is suposed to do that.

I would put a stock soft one in there for a strete car

No way , take me more than hour to take factory one