help! low speed shutter/ heartbeat new subframe. ..

[insideoutback]

Hi, 1st post. Been lurking for years, finally joined once I was certain my 'recall ' subframe was replace, and had a reliable car now.

So I thought.

 

02 ll bean outback.

 

Just had subframe replaced by a guy- apparently reputable, but we'll see.

 

Picked up the car less than a week ago, now,just today, I'm feeling a mild low speed 'thump/shutter/ heartbeat almost.

 

Only when in gear, usually from start up to speeds (unless at that point it's too fast to notice)

 

If I'm just barely creeping with foot on brake, very noticable.

If I let off on brake then hit neutral, it goes away, that's what scares me.

 

 

More background :

Replacement frame was from junkyard, decent shape, he came it was the correct final drive (after I asked).

He used most parts from the jy frame (eeasier?, yea, but could have very well been in better shape than my original.

 

So, what would make it shutter, yet 'appear ' to stop when in neutral (still rolling?)

 

 

To me, sounds unrelated to the replacement subframe, and more tranny, differential located, which shouldn't have been affected by the new subframe work?

 

 

It is soo noticable, that I'm sure I wld have felt it before this job was done.

 

Did this guy do something wrong?, or did I just blow 1200 on a positive that was on its way out?

 

Thanks so much for your patience.

 

T $

[insideoutback]

Yeah, I meant 'blow 1200 on a piece of spoob', not a 'positive ' Damn auto correct.

 

Thanks guys.

[Fairtax4me]

Axle problem or the bolts on the driveshaft may be loose. Need to take it back to "the guy" and get him to check it out. If he's truly reputable, he'll fix the issue.

[john in KY]

I'm thinking driveshaft. 

[insideoutback]

Thanks guys, I appreciate the quick responses. I hope it's that easy.

 

Does it still seem to be drive shafts noting that when I put it in neutral, the 'shutter' seems to stop?

 

Or maybe related to the fact that once in neutral, no torque os being applied to driveshaft?

 

(Just tryin to get my head around it)

I would have thought that if the shafts is making a throbbing while rotating, it would be there in any gear, as long as it's turning.

 

Thanks for input, I'll talk to ' the guy' and let ya know how it goes.

 

[1 Lucky Texan]

maybe using the FWD fuse would help diagnose it?

[insideoutback]

So,

 

I haven't had a chance to bring the car back yet, but the Throb/shudder/noise seems to have gotten worse. Still only noticeable from a stop though.

 

 

Now,

I did put in the FWD fuse (as suggested by 1 lucky Texan) , and the shuddering goes away.

 

Does this tell us something other than the fact that it's isolated to the rear somewhere?

Does this still potentially point to the drive shaft as some suggested?

 

 

Thanks, and yes I do plan on having someone look at it still. I just figured that I'd tap the knowledge of the professionals here in the meantime.

Edited April 9, 2016 by insideoutback

[Fairtax4me]

If it's getting worse you need to make it top priority to have it fixed.

A broken driveshaft is not a pleasant thing. It can cause a lot more damage to the car. I've seen broken driveshafts rips through floor boards and injured people inside the car. It could also be thrown out from under the car and injure someone else.

Don't keep driving it. Take it to get it fixed.

[1 Lucky Texan]

no other changes were done to the car? tires all the same size/model? rear diff and transmission the same as before?

 

if so, either some problem with the driveshaft ???? or, coincidentally, there's now a problem with system detecting slippage and trying to engage the wet clutch pack in the trans.