Shaking/Shuddering low RPM under load

[studbag]

Hey guys,

I've got an MY07 3.0r spec B which has started to shudder at low revs (1500-2500, sometimes 1500-2000) and then seems to be very slightly noticeable the rest of the time, ie it has a very slight vibration that I can notice under most circumstances.

At first I thought it could be my spark plugs but I'm ruling that out now as it isn't missing.

Only thing I can think of is I had the CV boots replaced at the last service as they were split (137,500k), could be a possible wheel alignment issue? I've never had a car do this before though so I'm not sure it would be that bad, and because it is at a specific point in the revs I don't know if this would be the problem.

It is exacerbated with more people in the car.

Any ideas?

Stu

[dawesy]

Could be a number of things . Like clutch cvs tyres
I had a vibration and noise taking off that went away once at a cruising speed that got worse over time till it turned into a loud thumping banging vibration/noise. Was a destroyed uni joint on the drive shaft

Do it feel more engine or driveline ?

[Elly27]

I have the same thing... The car most of the time is a testament to Japanese build quality, and then at very low speed - like parking - it gets all juddery and clunky.. Why is this? I have had the car checked over and all is well.. is it a "they all do that, sir" moment?

Ta for any thoughts on the topic..

[Elly27]

Could be a number of things . Like clutch cvs tyres
Do it feel more engine or driveline ?

Deff feels like drivetrain ...absolutely perfect ALL of the time, then it goes all clunky when parking... funny...

[studbag]

I'm leaning towards CV joints being buggered, anyone know what I'm looking at to replace them? It is bumpy at full lock at slow speeds like parking as well.

[zch91]

Did they replace only the boots, or the entire drive shaft?

[studbag]

Yeah it was only the boots they replaced as they had both cracked, I'll be replacing the entire shafts this time and I'll be doing the work myself.

[b3nzor]

Could be the rear diff mounts being as they are liquid filled, is one or both leaking?

[alessandro132]

If it's clunky on full lock, it's your centre diff. Common problem with the preface 6MTs. $1500 incl. labour should get you back on the road again.

[Out6ack]

Did you get this issue fixed Stu?

My H6 outback has the same prob after having done 156,000 k's.
Front driveshafts???

[Out6ack]

FIXED!
Mine had slight vibration @ 30kph. Any slower or faster it was fine. Replaced front driveshafts (myself, easy job) one at a time. Noticed a lot of improvement after replacing drivers side, then zero vibration after replacing passenger side.
Researched many driveshaft suppliers for best quality replacement s but concluded they're all made in China but best to get a remanufactured rather than new. I got mine from Jim at Central Driveshafts Sydney. Great service & only $99 ea + $15 delivery.
Looks exactly the same as the OE one's i removed.
Happy camper.
Cheers.

[studbag]

My replacement drive shafts arrived yesterday, I'll fit them this weekend and post the results.

[studbag]

Swapped mine yesterday morning, was straight forward and took a little over 2 hours myself.

Smooth as butter now! I got mine from A & L driveshafts. Feels so much better.