Now it's vibrating only under acceration, WTF?

[Jon]

The vibration maintains the same frequency of the drive shaft/rear end. Cruising at 30mph and there's a bad vibration but then I get off the throttle and immediately the vibration dissipates. Same thing at around 60mph but the vibration is of course slighter. Like a vibrating chair going from low to high. Get above 70 and it's gone. it's not steering or brakes. Engine and trans mounts are also in good shape. Maybe time for new U-joints? they feel solid. It's getting pretty annoying.

I need to do a good pressure washing underneath after last weekend's mudding but I just noticed this Thursday. Nothing noticeable when I left the trail.

I can feel a lot of vibration in the 4hi/4low shifter. No CEL. and engine isn't missing at all. Please help:sobbing:I hate vibrations like this!

 

[Elton H]

id start simple and say a wheel weight flew off

 

[TFJ-4runner]

I'd bet almost anything on your universal joint especially at 330k plus.

 

[Elton H]

o ignore my last post id say u joint to with them miles

 

[ChildrenOfBodom]

x3 u joint, happened to me too

 

[AddictedOffroad]

mud on the inside of the rear wheels. pressure wash it all.

 

[driffter33]

mud on the inside of the rear wheels. pressure wash it all.

X2 that's why I don't like playing in the mud It always leads to problems with the rig. I would check the wheels for unbalanced mud first.