Vibration at highway speed when downshifting

[Ramsfan78]

I noticed today that my truck drives good except when I'm like cruising at 60mph and then floor it. When I do that I get this weird vibration. It's still pulling hard so I'm not sure if its trans related or gear related. Weird thing is, if I ease onto the skinny pedal until its floored I don't get the shimmy. My right rear tire has been losing air for some time now and I have been having to refill it. I noticed this and figured it was from the low pressure so I aired it up again and it still did it. That tire btw is pretty worn. I am into the wear bar. don't worry, I'm getting tires in the next week or so. (Just gotta decide between BFG Rugged Terrains and Nitto Terra Grapplers) but that is for a different thread. Ha. I recently installed a 87mm TB from Moes and got Hemifever tuned. Sorry if this is TMI but I'm just trying to set the scenario for some good suggestions. Any ideas? Please help!


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[FancyStancy]

Could this have to do with the truck coming out of MDS?

 

[Ramsfan78]

Could this have to do with the truck coming out of MDS?

No. I should have mentioned I had the truck in 5 not OD. It has never done this before. This is new.


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[FancyStancy]

Well that's all I got to offer. Since its not a surging, and more of a vibration, it must be either gears or tranny imo

 

[Ramsfan78]

Anyone? Anyone? Bueller?


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