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suspect rear diff is Foobar'd


Gozling2
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Hi Guys

 

I've just joined the forum and already need some advice, ;) Forester 2004 2.0 XLN

 

I've a loud high pitched noise coming from the rear of the car, it's been getting progressively worse over the last couple of weeks, however, whilst out yesterday it seemed to be getting progressively worse/louder while driving.

 

I originally thought it was a wheel bearing but it makes no difference when cornering or braking. it comes on at about 30 mph and gets louder from that point onwards, I've jacked the car up and put it into 5th gear and had all the wheels running and the diff sounds very noisy, sounds as if something's grinding (I'm no expert but doesn't sound "Right" to me) sounds like a very harsh metallic sound, if I remove the diff drain plug later today I suspect I'll find a lot of metal "Bits" sticking to it.

 

How can I confirm the diff is the issue without actually removing it, is it possible to diagnose in situe.

 

I've seen a couple of Diffs on a well known auction site, however, they have part no's and I've no idea what part no my original diff is or if the replacements would fit,

 

1st advert is for a "Viscous LSD assembly.exc.vdc with a part no of 27020AA050" I've no idea what any of that means :(

 

2nd advert is for "Genuine Subaru rear diff, part no 01438300AA080 and advert says forester 2004" No sorry still non the wiser :(

 

Could any kind bod enlighten me as to which if any will fit my beloved Forester, I'm just out of my depth with this diff stuff :blink:

 

Many thanks for any assistance :D

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Hello & welcome,

Mr B is your best bet for a concrete answer on the diff but as far as I'm aware any diff with the same transmission and final drive ratio from a forester or impreza will fit, i'm guuessing yours will be a 4.11 or 4.44 final drive. Can you pop open the bonnet and read the gearbox code from the vin plate on the n/s strut tower, that will assist you in finding out what box is in there it will start TY and then a load of numbers

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Before you go full on with the diff. I currently have a dodgy wheel bearing which doesn't change noise under braking or cornering. Have you had anyone in the back of the car and try to place the noise? I thought mine was propshaft bearing until I had two rear passengers individually tell me it was only noisy on the drivers side.

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Thank you Stants for the information I will get the code toot suite and then post it, Scooby Ghost not had any bods in the rear yet as they are but will certainly do that once I've got a couple of suitable bods to listen.

 

Thanks guys 

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I've had a pal sit in the back of the Forester and it's coming from the NSR wheel bearing so a lot easier fix than the diff, just need to get it done, any tips for removing the Lateral bolt that looks like a bit of a B%*ch to get out if you can get it out at all that is man it looks well rusted into position, even the bolts at the top of the tie bars look well rusted into position, haven't looked yet can you get replacement bushes and bolts for the bars, any links to relevant sites to purchase much appreciated. 

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I've had a pal sit in the back of the Forester and it's coming from the NSR wheel bearing so a lot easier fix than the diff, just need to get it done, any tips for removing the Lateral bolt that looks like a bit of a B%*ch to get out if you can get it out at all that is man it looks well rusted into position, even the bolts at the top of the tie bars look well rusted into position, haven't looked yet can you get replacement bushes and bolts for the bars, any links to relevant sites to purchase much appreciated.

WD40 for a few days. Be careful of the brakes.
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Many thanks ScoobyGhost, I was going to get some Plusgas or Duck oil as they seem to penetrate rust better than WD and give it a good dosing every night for a week or so to give it time to work it's way through/in

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