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 Post subject: 2" Lift on SH Forester - vibration/shudder under load
PostPosted: Sat May 13, 2017 7:56 pm 
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Vehicle: MY12 Subaru Forester X3

Posts: 39
Location: Victoria
Hi all,

Hoping someone who has a similar setup can help. I recently installed a 2" lift on my 2012 SH Forester and have been having issues with virration/shudder under load in 1st and 2nd gear. I've spent a fair bit of $ trying to work out what the hell is happening and unfortunately am still no closer to finding the issue.

The following has been done:

- Wheel alignment and balance (twice at different workshops)
- new tyres
- full checkover of install (everything is in and installed per instructions
- checked cvs, boots etc
- checked spacer kit installed under centre bearing (aimed at aligning drive shaft angles?)

Gut feel is that the driveshaft is now misaligned or unbalanced, however when speaking to driveshaft specialists, they often just say that AWD aren't supposed to be lifted and it will never align properly or something similar. A few have offered to balance and see how it goes, but given how much I've spent I don't really feel like spending another $200 if they don't think it's the issue.

Am hoping others have done a 2" lift on an SH and gone through this?

I'm pretty close to taking the kit out, but I've already got ATs on it, which I'm guessing won't fit without the lift so I'll be down well over $2.5k to get it back to stock.

Any ideas would be appreciated!

Thanks in advance.


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 Post subject: Re: 2" Lift on SH Forester - vibration/shudder under load
PostPosted: Sat May 13, 2017 8:08 pm 
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Vehicle: MY12 Subaru Forester X3

Posts: 39
Location: Victoria
Just to clarify, lift was done by way of 2" strut top spacers, rear subframe spacers, camber/caster offset and centre bearing spacer kit.


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 Post subject: Re: 2
PostPosted: Sat May 13, 2017 8:33 pm 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17728
Location: Spearwood Perth WA
If the tailshaft has been spaced down, but the gearbox remains at original level, then that is quite possibly the issue. It needs to be all in-line.

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 Post subject: Re: 2" Lift on SH Forester - vibration/shudder under load
PostPosted: Sun May 14, 2017 8:59 am 
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Vehicle: MY12 Subaru Forester X3

Posts: 39
Location: Victoria
Thanks for the response.
Hmmm makes sense, although if I space the gearbox down, won't that just reduce the lift down to where it was pre lift? Or is the gearbox not the lowest point?


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 Post subject: Re: 2
PostPosted: Sun May 14, 2017 10:14 am 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17728
Location: Spearwood Perth WA
Spacing the gearbox down would be quite involved because the g-box is connected to the motor. And the motor sits ontop of the steering rack and the front of the control arms also connect to the engine crossmember. And the gearbox also has a shifter mechanism. And there is the lower U-brace at the front aswell. So all those associated parts would need to come down if you did it that way.

I dont know much about doing lifts. But that would basically be a full body lift. It gives better front and rear approach angles and all round clearance to the body. But not to the drivelines and crossmembers.

Im not really the one to be giving advice about it, as ive never played with lifting. Only de-lifting and body spacer removal. And not on SH either. Perhaps try getting in contact with " nachaluva "

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 Post subject: Re: 2" Lift on SH Forester - vibration/shudder under load
PostPosted: Sun May 14, 2017 10:32 am 
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Vehicle: MY12 Subaru Forester X3

Posts: 39
Location: Victoria
Thanks for the info. Yeah I got the lift kit from nachaluva and he's been very helpful in trying to help me work out what the issue is, but unfortunately no luck so far. Am hoping that someone else who's had the same kit installed on an SH has gone through this and can point me in the right direction as I'm currently dropping cash at a fast rate with no luck.
I think ill prob take it to a driveshaft specialist and see if they have any recommendations. If no luck, I'll probably have to bite the bullet and remove the kit and tyres entirely as no doubt this vibration is giving hell to the components around it.


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 Post subject: Re: 2" Lift on SH Forester - vibration/shudder under load
PostPosted: Sun May 14, 2017 11:27 am 
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Vehicle: MY12 Subaru Forester X3

Posts: 39
Location: Victoria
Just got under the car and checked the driveshaft with a bubble level and it's -7.6 degrees, which feels like way too much of an angle. It's much higher at the engine side and is on a decent angle when it's connected with the rear centre bearing. I know nothing about cars but feels like this is the likely culprit. Just don't know how to fix it.


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 Post subject: Re: 2
PostPosted: Sun May 14, 2017 11:48 am 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17728
Location: Spearwood Perth WA
I would have thought the tailshaft center bearing carrier should be matched to the level of the gearbox? I know when doing de-lifts on earlier models, not having the g-box and center bearing carrier matched can cause vibrations and shudders.

But given that your entire rear end is spaced, then its probs gonna cause issues where it meets the rear diff.

You could always look at a 1 piece tailshaft if your confident its the tailshaft mismatch causing issues. Could get an alluminium shaft for around 6-700 or a carbon fibre for like 1100.

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 Post subject: Re: 2" Lift on SH Forester - vibration/shudder under load
PostPosted: Sun May 14, 2017 11:57 am 
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Vehicle: MY12 Subaru Forester X3

Posts: 39
Location: Victoria
Yeah it's really difficult to tell where the issue is, however when looking at it, it feels like where it meets the diff is going to be the issue as that is where the angle seems most pronounced. I'm not super confident that it's the issue, but given most other things have been looked at, it seems likely. From what I've read, 7+ degrees is far too much of an angle. I'm no expert but it looks like the centre bearing spacer kit has raised the shaft in the middle which would misalign the angle at the rear further (although given my knowledge level on this subject I could be completely wrong here). If it was that, I'm guessing a smaller centre bearing spacer might decrease the angle and remedy somewhat?
Is a driveshaft shop the right place to take this? I've had it at two suspension shops and neither really had much of a clue. First place was completely useless and installed the strut top the wrong way around and the second just said to get the tail shaft balanced.
Thanks for your help anyway. Am thinking that lifting a subie was possibly a wrong move as it seems pretty complex (a dark art) given no shops no what to do to fix it.


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 Post subject: Re: 2
PostPosted: Sun May 14, 2017 12:29 pm 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17728
Location: Spearwood Perth WA
Id consider the 1 pice shaft. You should be able to buy them off the shelf to suit equivelant WRX with the same transmission. Or have one made at a driveshaft specialist.

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