Chasing a vibration

[popeye]

I have a 2012 Manual that I have been chasing a vibration on. It seems to really come on at 80mph. I was running an aluminum shaft and swapped back in the stock shaft but the vibration was still there. Set the pinion angle to a -1. Got a bit better but not a whole lot. On a whim I had the stock shaft balanced, and it was really off, I threw it back in. Bingo, nice and smooth everywhere and was smooth as glass right up through 115, But, on the deceleration there seems to be quite a bit from north of that 115 down to about 80. I'm gonna send the aluminum shaft back to the manufacturer for a balance but has anyone experienced the deceleration vibration?

 

[stkjock]

Stock wheels?

 

[popeye]

Stock wheels?

Yes stock 19" Gt wheels and the Goodyear allseasons

 

[luillo]

In for the same exact reason. I get it right at 80. Did flywheel/clutch and DS is getting balance. I am leaning towards tires/rims.

 

[s8v4o]

In for the same exact reason. I get it right at 80. Did flywheel/clutch and DS is getting balance. I am leaning towards tires/rims.

Is yours on acceleration and decel?

 

[luillo]

Is yours on acceleration and decel?

it used to be on accel and more noticeable on decel but after clutch/flywheel change is only at about 80 mph very light but on decel. Almost like u-join or bad pinion angle like if I had too much negative pinion. I had my pinion angle all the way up to verify if it was the problem but it didn't change. Like I said I think it is tires worn out. The tires are from July 2010.

My Drive shaft is getting repair/balance and the yoke is change to the new DIY yoke in case I need to swap the drive shaft to the two piece stock one to check on the vibration again.

after all this repairs I should finally find the problem.

 

[travelers]

Did your rear come with the extra weights on the ends and did you remove them?

 

[Blackbeast12]

If your car is lowered your pinion angle should be -2 not. -1...reset it to that and see if it goes away!

 

[luillo]

Did your rear come with the extra weights on the ends and did you remove them?

Yes. I removed them

 

[popeye]

If your car is lowered your pinion angle should be -2 not. -1...reset it to that and see if it goes away!

Thanks

 

[travelers]

Yes. I removed them

You might try it with them reinstalled.

 

[Thereaper]

I have the 80 mph vibration in my car. all stock with 6k miles.