Elusive vibration

[Waterloo]

(01-17-2019 )Mrkentee Wrote:  

(01-17-2019 )Waterloo Wrote:  Throw in new Cam and Crank sensors and see if that helps, they are the same part# and inexpensive. Prior to my in frame at Rawze's, mine had similar issues. Sounded like gravel under the floor board but only at certain RPMs. But, I had all of the wrong parts under the hood, along with worn bearings from what looked like a dry start.

Might be worth a try. I wonder could an unbalanced brake drum cause this, and how would you check it?

You doing some hard braking, riding them rolling down Grapevine, trailer on fire? Honestly, I doubt it is your drums.