Question about 2008 Subaru Forester

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Rear limited slip diff test

How can I test if My Rear limited slip diff is working. When I accellarate fast on a wet road the car pull to one side. Model: Forester XT 2008 MT.

-dirkt@icon.co.za

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Hi jack it up with one of your rear wheels off the ground the other on the ground if your diffs locked up it will stall and try to move your motor if its ok the wheel will just rotate the wheel that is off the ground rare to have a locked diff though plus if you you go round in a circle a right one then a left one it should go smoothly in a circle if the back end sways make a note of is it both sides or just one side yates210456

Posted on Oct 09, 2008

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Was stuck using 4 lo. Had 3 wheels spinning except l/rear,just sat doing nothing.


4 wheel drive is unfortunately a bit of a myth as in 4 wd any two wheels with no traction will not move you any where
so if you have both rh side wheels slipping,
go no where
left front right rear ,
going no where
the wheel that was not turning was the only wheel that had traction but through the differential action the other wheel spun faster
now with limited slip diff centers , both wheels have to turn as the differential action locks up so yes you would be going some where.
posi traction is the same idea
vehicles that have limited slip diffs are Toyota and Nissan as standard with some Nissans having limited slip diffs in the front drive axle as well
now if you are doing a lot of 4wd driving in adverse conditions , you need to have locker diff centers ( available from off road shops ) as they physically lock the diff actions ( with the flick of a switch) with the result if all 4 wheels are spinning and you are not moving , your stuck but if one wheel has traction you keep moving

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2 Answers

How can I get better traction in snow with my 2wd rear wheel drive pioneer it is terrible in snow.


ask diff reconditioners shop or off road shop if a limited slip diff center is available ( welding diff centers is not an option as it makes the car illegal on the road and dangerous to handle on a good road surface )

you need tall gears that do not loose traction because of the torque advantage from low ratios as in the switch on the dash. so don't use it in tow mode

as for tires there are special snow tires available with spikes in the tread , special tread patterns

( ask a tyre shop for what would be best)

extra weight over the rear end would help with traction

I would think that wide tires would tend to "aqua plane" as they rode up over the snow but talk with a tyre shop again on that

there may be a diff locker available from an off road shop

Consider changing the entire rear end to get the diff operation that would best suit you

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1 Answer

I have a 97 vzj95 prado 3.4lt v6 Recently the front diff seized and I've replaced it but now on turns while accelerating I'm hearing a clunk from the rear diff... Is this a wind up issue? Thanks


Yes it is a wind up of the axles and not the drive shafts. Your car has a limited slip diff and it is locking up.
When you are accelerating the diff locks up and your wheels are rotating at different rates while turning. This causes the axles to twist until the pressure causes the Limited Slip Diff to slip.
My guess would be that someone has changed the diff oil with non Limited Slip Diff oil.

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1 Answer

How to install auburn gear limited slip in 67 Chevrolet 10 bolt differential ?


remove the axles, undo the back plates from the housing. remove the diff carrier bolts . take care to keep shims to the same side of the bearings. pull the diff centre out. remove crown wheel from the diff carrier . fir crown wheel to the new diff carrier (limited slip centre) . Refit carrier into diff housing. Best advice --have an accredited diff shop do the job for trouble free operation.

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1 Answer

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pull the drain plug and check for metal bits on the magnet. The only items working when changing direction is the side gears in the diff of the diff locking system in a limited slip diff. Failure is very rare for these parts unless there has been incorrect oil used in a limited slip diff. Jeep diffs use a "C" clip on the end of the axle inside the side gear and it is possible that one or both clips have become dislodged and and become immeshed in the gears

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I had a 1997 Ford Crown Victoria with An H9 rear axle code. I want to know what rear axle code is comparable to the H9 for a Mercury Grand Marquis?


reading forums on this reveals that the h9 is a 3.55 limited slip diff mainly used in f150 fords. However all that is immaterial as what you are looking for is a diff centre that is 3.55 ratio that will fit in your housing . The same housing will use the both LSD and normal diffs as the LSD was an option offered for off road vehicles or vehicles operating in bad road conditions

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1 Answer

I have a 1991 trooper front wheels not pulling in 4wd I have jacked the car up while in drive and in 4wd front tires turn but can be easly stopped does this vehicle have a limited slip drive? if not what...


Toyota do not normally have a limited slip diff in the front as it creates handling problems and economy problems that most drivers did not want. If you have the front axle jacked up so that both front wheels ore off the ground then both wheels will turn or one will turn more than the other or when you hold one wheel the other wheel goes twice as fast. If all that is happening there is nothing wrong with the diff. . If you have automatic hubs make sure that they are working under load

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This may depend on which side of the support bearing the slip joint is on the tail shaft. If it is on the diff side of the bearing then the problem will be that the slip joint has seized and every time the diff rises or falls from load or bumps in the road instead of slipping it pushes the whole shaft forward or pulls back to allow for the changed length of the distance from diff pinion and rear of gear box. If the slip joint is in the rear of the gear box then you may have to alter the angle that the mount has to the drive shaft. On a Mazda I had I found that the mounting plate was square to the chassis but the bearing needed to be about 3 degrees off to compensate for the drive shaft angle. This meant that the ball bearing was under mis-aligned load from the hard rubber and caused premature wear of the bearing

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1 Answer

DIY Repair


Your explanation is stating two different rear end styles. Limited slip and posi-traction. But either way if you have a wheel that won't engage when one slips with limited slip or one that doesnt turn with posi then you either have a broken axle or an internal differential issue which can be confirmed by pulling the rear cover off the diff.

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