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Discussion Starter #1
So I've got an issue that has been around since I got this truck it's an 07 2500hd duramax w/allison.
Between 60- 70 when accelerating I get a decent vibration that seems to get louder and quieter if my suspension is flexing but either way always a vibration and rattle between those speeds. I've got new suspension, brakes, tires, sway bar and drive shaft suport bearing and for 3 yrs it hasn't gotten worse or better.
Any thoughts.
Thanks
 

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First thing that comes to mind is a condition called Frame Beaming. Look up that within this forum and see if those symptoms line up with your issues. Other things to check would be to jack the front end up and look play in steering parts. I believe this is the part number for new body mounts to solve the frame beaming issue, but check the fitment for your truck. GM#25994881 let us know what you find!
 
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