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Originally Posted by TundraSoul
Curious, do you think the vibration is coming from the forward movement of the vehicle, or the actual drivetrain components that are moving? I wonder if the vibration could be reproduced, say on a dyno with just the rear tires turning?
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I *think* it's slop in the rear diff personally, although I don't have the kind of expertise DJ and others here do. It's totally repeatable, so yes I think this can be seen on a dyno as long as the rear wheels get up to highway speeds.
The reason I think that it's rear diff slop is that the vibration gets stronger when you ease up on the gas pedal slightly, and it gets weaker during acceleration and deceleration. I attribute that to backlash in the rear diff but am open to other ideas.
I'm half-planning on putting in a Eaten electric locker with LSD in the back, and then carefully inspecting the Toyota orginal when it's out. If I go that route I'll put photos and measurements up on a website for everyone.