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Old 12-11-2013, 12:42 PM   #1
Skoolhater
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Default GC8 locked drivetrain - HELP!

Okay here's my dilemma, It's winter here in good ol' South Dakota and I was drifting around the streets pretty hard and my 2nd gear developed a really bad whine, presumably a bad syncro or a gear out of alignment. After that I drove it pretty nice. Yesterday I drove to the store, went in and came out after maybe 5-10 minutes and the car scooted forward about a foot and then I couldn't go forward or reverse... end all I had it towed to my utility shop (not an automotive shop) where I work and had it pulled onto a flatbed, and the whole way up the flatbed and the whole way down all 4 tires were locked up. I'd hoped something would thaw out over night and my problems would be solved... well that's not the case. I guess I'm not sure where to start, yank the trans out and assume its that?? Also my clutch was garbage and slipped pretty bad before the "incident" so I guess any advice or standard protocol would be greatly appreciated. P.S. it's a 99 rs coupe 2.5 with a 5spd. Thanks.
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Old 12-11-2013, 02:11 PM   #2
Patrick Olsen
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So even with the clutch pedal depressed the wheels are locked up?

Either way, it certainly sounds like the transmission ate itself. 2nd gear on my 5MT went a few years ago while my brother had my car. As I recall, he said it made a little bit of noise for a couple seconds and then just locked up. I'm pretty sure mine would still roll, though.
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Old 12-11-2013, 02:31 PM   #3
cal_look_zero
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Probably ate the center diff up and tossed chunks into the gears. Time for a new tranny.

By the way, your car is a GM6, not a GC8. Just FYI.
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Old 12-11-2013, 05:44 PM   #4
Skoolhater
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Ahh. yeah I'm new to Subarus and imports in general, my apologies on the gm6/gc8 confusion. so is the center diff connected to the transmission? I still have the car thawing out. So if a new trans is my next step, which transmissions will work as a direct replacement? and which other parts could possibly have been damaged?
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Old 12-11-2013, 07:14 PM   #5
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Quote:
Originally Posted by Skoolhater View Post
Ahh. yeah I'm new to Subarus and imports in general, my apologies on the gm6/gc8 confusion. so is the center diff connected to the transmission? I still have the car thawing out. So if a new trans is my next step, which transmissions will work as a direct replacement? and which other parts could possibly have been damaged?
It's part of the transmission. You'll need to look for a white sticker near the starter for a series of letters and numbers; something to the effect of "TY-754VCAAB", then you cross reference it here: http://www.gearhack.com/myink/ViewPa...ission%20Chart and determine what final drive you need.
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Old 12-13-2013, 11:21 AM   #6
Skoolhater
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okay. so I have the car off the ground and when its lifted none of the tires are locked up... any input? trans for sure? is it possible the clutch being bad locked something up?
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Old 12-13-2013, 12:22 PM   #7
cal_look_zero
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I want to say that indicates a broken differential. If you move a wheel, does the same one on the opposite side move the same direction? I.e. if you spin the passenger rear wheel forward, does the driver rear spin forward as well?
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Old 12-13-2013, 03:39 PM   #8
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Transfer case. It's apparently more common than this forum indicates and a main failure of these transmissions although I've barely seen a peep of it on these forums. My car did the same thing. The transfer case comes right off the back end of the tranny, so you don't have to take apart the tranny to fix it.

Just an example(there's other resources around):
http://www.subaruforester.org/vbulle...ce-them-46979/

From the diagram on the link, my {25} gear broke a tooth and basically locked up the transmission.


Now this doesn't produce gear whine. If you have a whine under load that gets louder with more load and changes pitch with speed in that gear, it means the gear surface is damaged in some way. Gears are normally quite silent without wear. I've only managed to wear the backside of my rear diff gear personally due to being forced to use unmatched tires for 70 miles. I boiled the diff fluid pretty well and caused a bit of wear. I test drove an old WRX with gear damage, so it would whine in a couple gears due to heavy abuse by the previous owner. It ran but would whine.
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Old 12-13-2013, 06:37 PM   #9
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when it was all connected, when I'd spin the passenger wheel forwards the drivers wheel would spin backwards... same for the rear and vise versa. anyways. I was just gonna pull the whole transmission and transfer case together and take them to Subaru to be checked out, I need to put a new clutch in anyways. But I have what I believe to be all the bolts taken out and it does not want to come away from the motor. does anybody know where I could find a diagram of the bellhousing for the bolt locations? I have 4 studs taken out and 2 nuts as well as the thing on the hanger from the top middle part in the engine bay.
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Old 12-15-2013, 09:44 AM   #10
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Quote:
Originally Posted by Skoolhater View Post
when it was all connected, when I'd spin the passenger wheel forwards the drivers wheel would spin backwards... same for the rear and vise versa. anyways. I was just gonna pull the whole transmission and transfer case together and take them to Subaru to be checked out, I need to put a new clutch in anyways. But I have what I believe to be all the bolts taken out and it does not want to come away from the motor. does anybody know where I could find a diagram of the bellhousing for the bolt locations? I have 4 studs taken out and 2 nuts as well as the thing on the hanger from the top middle part in the engine bay.
Should be 8 fasteners IIRC. 6 bolts and 2 nuts (studs). Also, there is no transfer case, just front diff in the case and center diff at the rear, also part of the whole assembly. Check with the dealer you plan to bring that too as many don't know **** about the inner workings of those and just out source the work.

The wheels turning in opposite directions when of the ground by hand is how a differential works
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Old 12-15-2013, 05:27 PM   #11
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Cool, thanks for the help. what are the 8 IIRC fasteners?
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Old 12-16-2013, 04:59 AM   #12
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IIRC - if I remember correctly
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Old 12-16-2013, 09:08 AM   #13
Patrick Olsen
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Quote:
Originally Posted by Skoolhater View Post
when it was all connected, when I'd spin the passenger wheel forwards the drivers wheel would spin backwards... same for the rear and vise versa. anyways. I was just gonna pull the whole transmission and transfer case together and take them to Subaru to be checked out, I need to put a new clutch in anyways. But I have what I believe to be all the bolts taken out and it does not want to come away from the motor. does anybody know where I could find a diagram of the bellhousing for the bolt locations? I have 4 studs taken out and 2 nuts as well as the thing on the hanger from the top middle part in the engine bay.
I think you mean you have 4 bolts removed, as there should only be 2 studs (which correspond to the 2 nuts you've removed). Even once you have all the bolts removed, the 2 dowel pins can be quite stubborn.

This should be correct:


Note that early EJ25s didn't use as many fasteners, but I believe they went to the 8 fasteners when the Phase II engines came along (which is what your '99 has).

Quote:
Originally Posted by RaceFaceXC View Post
Also, there is no transfer case, just front diff in the case and center diff at the rear, also part of the whole assembly.
Tell that to Subaru. Apparently they need to correct the Factory Service Manual.
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Old 12-16-2013, 10:26 PM   #14
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alright everyone, I really appreciate all the help. got it out and taken to the shop today. thanks a ton!
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Old 12-18-2013, 01:13 AM   #15
subi400
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There is a nice thread on here about the phase 2 center diffs 99+ that have had an issue with the retainer rings popping out on the part of the center diff that is facing the rear of the tranny. If one or both retainer rings pop out then it can cause some major issues and damage.

I have a 2000 outback 4.11 5 spd tranny and decided to take it apart to see how those rings looked. I got it apart and they were both there in place so I am going to have someone put a few tig tacks to keep them in place permanently.

Now there is the possibility that one of these rings popped out and caused an issue, but who knows. Let us know what you find out. Try to get a picture if you can too.
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Old 12-18-2013, 01:56 AM   #16
REED FLEMMMMING
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I've seen something similar on a 98? legacy wagon with a 5 speed. The spring on the hill holder broke and it locked all 4 brakes. Forgive me but I don't remember exact details.

ixnay that, just read again how when lifted you can spin tires
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Old 12-18-2013, 03:05 PM   #17
Skoolhater
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I took the transmission to a tranny shop and what had happened was the front seal of the trans went bad and i lost some tranny fluid on the clutch (causing it to slip) but had then seized up a bearing inside it
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Old 12-18-2013, 03:06 PM   #18
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Anybody running a lightweight flywheel on a 99-01 rs with oem clutch??
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Old 12-18-2013, 03:44 PM   #19
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Answered in your other thread.
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