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Old 07-31-2003, 05:45 PM   #1
Damon
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Default need suggestions: my rear end is going out

whats up everyone.

ive determined my rear end (or some part in the rear end) is on its way out. id much rather just replace the entire rear end, not try to figure out what part is messed up. i have an 01 RS, and im wondering if anyone has a guestimate on what the ENTIRE factory rear end would cost... im not really worried about upgrading (unless an aftermarket setup would be cheaper), and i espically dont wish to use junkyard/used parts.

if anyone has any other ideas/suggestions, im all ears. thanks for the help.
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Old 07-31-2003, 07:33 PM   #2
ciper
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Which part exactly, the differential?
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Old 07-31-2003, 08:49 PM   #3
mechboy
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the rear diff is like super easy to take apartno special tools needid..i just did mine and it took 2 hrs to drop and like 1 hr to rebuild.....

what is your car doing is the diffing action not working.. a tire drags on sharp turns this is my problem and it was not the diff.
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Old 07-31-2003, 08:59 PM   #4
Damon
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the initial problem i heard was a loud roaring coming from the rear end of the car while i drive. its gotten progressively worse, and now when i start getting up to speed from a stand still, the sound goes "wooooooo... wooooo... wooo... woooowoooowoowowowowowowo" (if that makes sense at all).

my dad and i put the car up off the ground today. you can work one rear wheel back and forth, and a loud *clunk* comes from the diff. i started the car up and drove it, and odd sounds were definately coming from the rear diff.

i have sourced a brand new rear differential for 685 (basically cost), but if anyone thinks there is a cheaper way, im all ears.

note, its a 01 RS, not a wrx.
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Old 07-31-2003, 09:02 PM   #5
Damon
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mechboy, im assuming the rear diff. in your car (if its what is listed on your lil' profile) are the same/similar. if you could, what tools did you use, and do you have a service manual to go by?

i cant say i want to pay the dealership whatever they would charge if i can do it myself.
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Old 07-31-2003, 09:20 PM   #6
ciper
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Damon: I think you are wrong.

The sound you describe is so perfect of a description for a bad wheel bearing its not even funny.

Having free play is completly normal, remember you have to take up slack of four cv joints, three universal joints and the gears in the differential itself.

I dont want to be mean but its not smart to throw money at the car without knowing the problem.

Mechboy is somewhat deceiving. The differential removal and disassembly is not as easy as he makes it sound. His idea of special tools doesn’t include feeler gauges or a breaker bar and vice. The ring gear alone has 12 (if I remember right) bolts that have been loctighted. Also without a lift and a helper its damn near impossible to put the differential in place, slide both axles in and start a bolt to hold it.

I know because I took a 4.44 LSD and a 4.11 open diff, swapped parts and made my own 4.11 lsd. Installed it on my own in the driveway too.
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Old 07-31-2003, 09:49 PM   #7
Damon
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cipher:

thanks a lot on the opinion man. i took my dad's opinion for what it was because hes a mechanic. he really is more a chevrolet person though... he does drag cars and such, so i just took his opinion for what it was.

ok... well if you think thats the issue (wheel bearing) how do i know exactly if thats the problem? and whats the cost of a new one?

i would have taken it straight to the subaru dealership, but the one i bought mine closed 3 months after i bought my subaru there. the closest one (dealership) is around an hour and a half drive
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Old 07-31-2003, 10:40 PM   #8
ciper
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Can you get someone to climb in the back of the car while you drive?

Find a place with a concrete barrier or a wall and drive next to it. Have them sit in the rear right and listen. Also have them open the window and listen. The move to the left.

Another way to tell is to put more stress on it, take some long high speed turns (on ramps are great) in either direction and see if the sound increases or decreases depending on direction.

Also just for fun you could switch the rear wheels, this wouldnt test for a bad bearing.



I guess if the bearings that hold the gear set in the differential are failing it could make the exact same noise, Ive never heard of differential going bad this way though. Usually a diff is bad because the lubrication leaked out or a tooth cracked.
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Old 07-31-2003, 11:26 PM   #9
Damon
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thats a lot for the help cipher. i will definately give that a try tomorrow. im taking it to a mechanic friend and we are going to put it up on the overhead rack and take a 'closer' look & listen to it all.

i spoke with my uncle and he had to change out a wheel bearing on his daughters car that had the same symptoms. im crossing my fingers this is what it is.

one more quick question... is it possible to pull off the wheel bearings while the car is off the ground, crank it up and run it in gear w/o any adverse effects? logically, if the bad wheel bearing wasnt attached while in gear, the horrid sound would not be present.

on a side note, i just changed the fluid in the diff. not 3 months ago. there was hardly any metal shavings on the magnet and the fluid looked pretty good.
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Old 08-01-2003, 11:13 AM   #10
Tim Sanderson
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AT-A-BOY CIpher! Now that's what I call help.
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Old 08-01-2003, 01:13 PM   #11
Austin
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Quote:
Originally posted by Damon
one more quick question... is it possible to pull off the wheel bearings while the car is off the ground, crank it up and run it in gear w/o any adverse effects? logically, if the bad wheel bearing wasnt attached while in gear, the horrid sound would not be present.
I'm pretty sure you have a viscous rear lsd, so it's not advisable to try to run the drivetrain in gear while the car is off the ground. Viscous diffs overheat.

If you want to test for a bad wheel bearing, lift the car and just rotate one corner by hand & listen. Also, push/pull on front/back and top/bottom of that corner to check for play.
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Old 08-01-2003, 02:07 PM   #12
Damon
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w00t! i was just informed that if its the diff. its still covered under my drivetrain warrenty!

if its the wheel bearing, well then i have to pay... but im not worried about that... its going to be MUCH cheaper im sure than an entire differential.
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Old 08-05-2003, 11:27 AM   #13
reks
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I had my left rear wheel bearing replaced under warranty. I'm pretty sure it was the drivetrain warranty at around 35k. I would think that would be covered.

Now it sounds like my front right bearing is going at 68k. Anyone have an idea what a fair price for the replacement would be (parts and labor)? I don't particularly trust the dealerships around here.
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Old 08-05-2003, 02:01 PM   #14
ciper
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Damon: Running it off the ground would probably get rid of the noise itself. Its quite a bit of work to disconnect a "wheel + parts" from the car just to test. If you really wanted to the easiest way would probably be to disconnect the axle from the differential.

Which part of the differential failed? Was it a bad bearing or?
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