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Discussion Starter #1
So, over the last year or so, I've had my styled steel wheels balanced and rebalanced ( on the car ), new u joints, driveshaft balanced, new axle bearings, etc.. etc. Yesterday, I finally got around to the TRANSMISSION MOUNT....Man, it's a miracle...smoooothh. Almost like a new car.......hope and perseverence can overcome your problems.
Thanks to all who offered help and advice.

OK, so, let's see.....what's next on the list?
 

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what sort of vibration were you getting? Was it constant, progressivly worse, or come and go at different speeds? What speeds did you notice the problem? There are a lot of mustang people what have vibration problems, it would be nice to know a bit more about the symptoms a transmission mount fixed.

Thanks
 

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I did the same thing - Including an aluminum driveline! A transmission mount made the problem sincerely better. The best $19.99 I've ever spent for sure.
 

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Discussion Starter #4
Motorhead....all of the fixes I referred to made incremental improvements to the overall driveability. Each "achievement" made it a different car. But, there remained a harshness in the drivetrain. I think it may be described as a cyclic vibration or like a droning or thrumming sound. It seemed to be rear drivetrain related.

The transmission mount replacement was a breakthrough. When I compared the old and new mount on the bench, there was a marked difference in the thickness or height of the rubber and the new one had much more "give". The car really is remarkably smooth , now.

Hope this helps.
 

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This sounds like something I might need to do. My car usually vibrates at idle or in reverse. How hard was is to install? Where did you get the mount?
 

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I went to almost the exact procedure a few years ago. The vibration was very bad and I tried almost everything (balancing, U-joints etc etc). Then I got a tip from someone to change the transmission mount. The old one still looked good and wasn't hardened. The only difference I could see was the height. After the first testdrive it was driving a new car!
 

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Discussion Starter #7
PITA....remove the nuts from the bolts through the crossmember, using a flat piece of plywood to protect the trans pan, use a floor jack to raise the transmission. Use patience to remove and replace the mount. Check with National Parts Depot or Mustangs Unlimited to start.
 

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Wow--I just did this this weekend (replaced the Xmember insulator). I was really getting discouraged about my vibration problem, thinking I had a bent frame or something else terminal. But, I went to Autozone, got an insulator for $9.00, changed it out in about 20 minutes, and the vibration was GONE!. Unbelievable.
 

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Great tip ! I'm having my tires swapped this weekend...I'm told they are out of round, and that that in addition to a loose idler arm are the cause of my front end vibrations....

If that does not do it I'll try the tranny mount. Thanks - Dickson
 

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I got to second the idea of the transmission mount. I went through many different things trying to track down vibration, but the transmission mount definitely fixed a good majority of it. The only vibration I get now is those aerodynamic ones up around the 100mph range....

Dave
 

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it could be possible that a sagging mount would throw off your pinion angle
 
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Yep, went through all the steps trying to track down my vibration, (most pronounced at about 60 mph... kind of a thrumming). Someone finally suggested the transmission mount insulator and what a difference!!! One of the best things I have done on my '65. The rubber was so gone that it was metal to metal so all vibrations were going straight into the frame! I can only imagine what the rubber in the motor mounts look like; sometime I will get to them also. Glad u found it out. I spread this one to anyone I talk to w/ a vintage Mustang.
 
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