So I've been ignoring a vibration for long enough now(like 5 years) and I'm thinking it's time to fix it. I remember a TSB for these trucks to replace the transmission mount and a body mount for drive line vibration but I never did one. Anyone with experience on this?

 

I went the other way. I replaced my transmission mount when I replaced a cracked tailshaft housing and used one with a harder rubber. This introduced a mild vibration that I decided to live with, so I can confirm that the mount can cause a vibration.

 

Well I guess I should get the revised Ford part instead of going with anything aftermarket then. Thanks for the info!