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Old 03-04-2012, 03:38 AM   #1
crex11
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Member#: 298039
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Scarborough, ME
Vehicle:
05 WRX
WRB

Default Need help! 99 Legacy transmission/gear oil change

so recently one of my transmission fluid lines started leaking on my 1999 legacy due to a clamp that had rusted off. it was leaking really bad at first but as soon as i got it home putting a new clamp on it was an easy fix. because of the leak i had to guess that i lost maybe a half to a full quart of fluid due to the leak. I picked up this legacy a few months ago before winter so i could store my 05 wrx during the winter. I figured since some of my fluid had leaked out and i needed to add more, i might as well just do a tranny fluid change on my car while i was at it, as i have no clue when the last time the fluid was changed in it.

I planned to do a simple drain and refill, i started by draining the old fluid out of the transmission pan, about 3 quarts of old fluid came out. Here is where the problems started. I went to what i thought was the transmission fluid dip stick on the passengers side of the car. First of all the yellow plastic dip stick was stuck terribly in the hole and broke when i tried to pull it out, so i drilled a screw into it to pull on and finally pulled the whole surrounding metal piece out with it. I added about 4 quarts of fluid when i realized on the 4th quart it was overflowing. After being confused for a while of why 4 quarts would over flow the transmission i did some research and found that these transmissions have different dip sticks, one for gear oil and one for trans fluid. long story short i filled the wrong one with tranny fluid and now i have 4 quarts of tranny fluid mixed in with my gear oil and an empty transmission, which explains why my car wouldn't move more than 5mph at 4500 rpm when i tried to pull out of the garage.

so it looks like i can fix it by draining the gear oil and putting in new gear oil, then refilling the trans with new ATF in the correct hole on the drivers side of the car. my questions are
1) Where do i drain the old gear oil (now mixed with 4 quarts of atf)?
2) How much gear oil do i need to refill it?
3) What kind of gear oil do i need?
4) Did i do any harm to my car by making this mistake? (my WRX does not have 2 dip sticks in the transmission like that so i had no idea i was making a mistake at the time.)
5)Any other advice at this point?

Any help is greatly appreciated!
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Old 03-04-2012, 10:08 PM   #2
CosmoTheCat
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Join Date: Jan 2001
Chapter/Region: NWIC
Location: Woolley
Vehicle:
1998 Ram 2500
Green.

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Your WRX is a manual, which shares its fluid with the front differential. The autos have different fluid, requiring 2 different dipsticks.

Did you do any harm? That's entirely dependent upon how long you ran it with no fluid... You could have significantly worn your clutches.

Assuming we're talking about a 2.2 AWD car, you need 1.3 quarts, 80w-90.

https://www.autotransparts.com/images/products/454.jpg

You see where the differential dipstick goes? Below that and toward the front is where the axles go in, and below that on the bottom there is a bulge... that's where you'll find the drain for the front differential.
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Old 03-04-2012, 11:18 PM   #3
crex11
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Join Date: Oct 2011
Chapter/Region: NESIC
Location: Scarborough, ME
Vehicle:
05 WRX
WRB

Default

ohh ok that explains some of my issues! thank you! and i literally only pulled it out of my garage, realized something was wrong, and pulled it back in to park it. I'm guessing i didn't do much harm, its not like i drove it down town or for an extended period of time. my legacy is actually the 2.5 DOHC, so does that change anything or will i still need 1.3 quarts of 80w- 90? and how many quarts of transmission fluid am i suppose to pour in when doing a simple drain and refill?
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Old 03-05-2012, 09:50 PM   #4
CosmoTheCat
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1998 Ram 2500
Green.

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No difference according to the FSM.

Drain and fill we typically replace about 4 quarts, depending on how long we let it drain. I don't think we've ever had more than 5 quarts come out unless we're taking out the valve body.
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Old 03-06-2012, 12:06 AM   #5
crex11
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Member#: 298039
Join Date: Oct 2011
Chapter/Region: NESIC
Location: Scarborough, ME
Vehicle:
05 WRX
WRB

Default

Ok well I added 4 quarts, just to the wrong dip stick. I would have done it exactly right if I knew the trans dip stick was on the other side. So ill drain the front differential and add 1.3 quarts of 80w-90 gear oil and then add 4 quarts of trans fluid to the proper dip stick tube this time and I should be good to go!
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