2008 Tribeca Trans failure - help - SB9T.com
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Old 11-12-2019, 03:00 PM   #1 (permalink)
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Default 2008 Tribeca Trans failure - help

Car has 118,000 miles, runs great. We've put almost 30K on it. I changed* ATF and filter a few months ago.* (yes, i used the right ATF)*

Tonight the trans did a bunch of bad weird things.* Driving on the highway it begins surging, RPMS go to 4000 rpm.**

Slow the car down to about 45 and it stabilizes somewhat.* Forced to stop at a light and it can barely move,* at this point my wife pulled over and waited for me.

When i got there the ATF was normal level,* we fired the car up and drove off.* She was able to maintain 45-50 for the drive home.* ATF light came on but i could not retrieve a code.*

When i put it in park it made a grinding noise and park did not hold the car.*

Also clunks going into reverse.

Obviously we are not driving it but there are no Subaru shops around here so it's gonna sit until i have an idea how catastrophic this is.*
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Old 11-12-2019, 04:05 PM   #2 (permalink)
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If you can pull the code - that's the best. You will need FreeSSM. Search subaruoutback.org for that term.

Otherwise, it sounds like something is mechanically wrong since the parking pawl didn't engage.

Path of least resistance will be putting a used transmission in. This is a rare failure, and a low mileage transmission would be great. I think this is a common transmission with the H6 outbacks. but you should check to be sure.
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Old 11-12-2019, 05:21 PM   #3 (permalink)
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Ok, trans with less than 100K is around $1200

How hard is it to change?
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Old 11-12-2019, 06:41 PM   #4 (permalink)
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It's not hard, but you have to either pull the engine or drop the transmission from below. Depends on what equipment you have.

A number of people have done this, but I don't have a link to send you to...

Most common problem with the swap is making sure the engine and the transmission are lined up when putting together. People sometimes push the spine shaft in to the transmission and crack the transmission pump.

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Old 11-12-2019, 06:44 PM   #5 (permalink)
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https://independentmotors.net/subaru...-transmission/

Note: Harbor freight sells a pretty inexpensive transmission jack. I haven't used it, but some day I will have to replace my clutch on my legacy GT and that is my plan. I just need to see if I can lift the car high enough.
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Old 11-13-2019, 02:55 AM   #6 (permalink)
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Could it be the differential ?

Without any expertise I am trying to work through the symptoms. We limped it home (about 20 miles) and sometimes it would slip badly and sometimes it would engage pretty well and behave almost normally.
If the front differential was bad would that account for these symptoms?
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Old 11-15-2019, 07:03 AM   #7 (permalink)
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If you do replace the front axles, it not too bad of a DIY job. I bought aftermarket axles from Rockauto for under $100/each. They fit perfectly and so-far-so-good after 10k+ miles.
This helped me: https://www.youtube.com/watch?v=J2o0Ln9P17w
I didn't experience the problems you described though mine were just wore out...the car would roll a little after putting in park.
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Old 11-15-2019, 11:06 AM   #8 (permalink)
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Front diff is integrated with the transmission, and most people replace them together.

It could be a number of things.

It sounds like the transmission is slipping (worn clutch packs) but it's worth a detailed diagnosis.

Tom
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Old 11-22-2019, 10:38 AM   #9 (permalink)
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Quote:
Originally Posted by hertfordnc View Post
Could it be the differential ?

Without any expertise I am trying to work through the symptoms. We limped it home (about 20 miles) and sometimes it would slip badly and sometimes it would engage pretty well and behave almost normally.
If the front differential was bad would that account for these symptoms?
It also could be the transmission valve system. I'm at work right now, but when I'm home I try to take a picture of our old one and look up the part number. It is basically the lower end of the transmission and it is s separate part.
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Old 11-29-2019, 12:56 PM   #10 (permalink)
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Transmission value problems would result in codes. Are there any?
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Old 12-01-2019, 12:16 PM   #11 (permalink)
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More info- I've lost front wheel drive

I attempted to roll the car into my garage to have a look. There's mud, it got stuck, no traction to the front wheels. I had to back out of the mud.

Then i took it to the dirt driveway and attempted to spin the tires - only the rears would spin.
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Old 12-01-2019, 01:10 PM   #12 (permalink)
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Quote:
Originally Posted by tdelker View Post
Transmission value problems would result in codes. Are there any?
I agree. But he hasn't retrieved the codes yet.
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Old 12-01-2019, 01:14 PM   #13 (permalink)
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Quote:
Originally Posted by hertfordnc View Post
More info- I've lost front wheel drive

I attempted to roll the car into my garage to have a look. There's mud, it got stuck, no traction to the front wheels. I had to back out of the mud.

Then i took it to the dirt driveway and attempted to spin the tires - only the rears would spin.
If you are having will spin, that maybe a failure in the system that transfers power between the wheels. Did you ever get the transmission codes pulled? Those are vital to getting the facts right in your situation. Doesn't mean that the answer will be cut and dry, but it is better than guessing.
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