Vibration after installing diff bushings
 

So yesterday I installed new front and rear diff bushings from Z1 at the same time I installed a pumpkin with a VLSD. Now I’m getting a strong vibration from the back of the car at any speed over 40mph. I’ve checked everything and it’s tight and correct, any ideas what could be causing this?


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Driveshaft?
Wheel balance?
Missing ring gear bolt?
Oh, so many options...
I hope you can find it soon.

Kirk B.

Could just be the busings itself since they are stiffer. Give it some miles before it could settle in a bit. My 2 cents...

It was definitely more than than increased NVH, it sounded like the car was about to fall apart.

I found the problem, the new differential I put in had a bent input shaft. I switched it out with the original diff and all is good.

My new plan is to put 4.08s in the diff and switch it out in a few months.

I'm glad you figured it out, should be a relief.

Yeah, I was freaking out trying to figure out what could be wrong. I'm kinda pissed, but at least I can drive my car.

Good deal. Glad you found it.

Kirk B.