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Old 07-02-2006, 09:44 PM   #1
Durmiente
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Default changing tranny fluid and differential fluid for first time

My 02 WRX is the first manual tranny car I've ever owned. I got it used with 26k miles - no idea if they changed the fluid before I bought it. Its at about 37k now and I've been meaning to change it and the rear diff fluid. from the sounds of it, I think I'll go normal dino oil 75W90 with 1 qt syncromesh for the tranny and maybe mobil 1 synthetic or other good synthetic for the rear diff (any suggestions for the rear diff?) This is after a few hours of research... i want the syncromesh mix as my gears grind occassionally or act up...

my car's tranny acts different day to day... one time this week it was very strange - kept having a hard time getting into first and I had to let out the clutch and depress it again to get it to go in... another time I was at an auto-x and in between my runs it kept grinding going into first... other than that, I have occassional grinds going into reverse, also sometimes if I am driving extremely spiritedly and am shifting fast I grind going into 4th. I would say I am a pretty spirited shifter - I shift pretty fast when I want to, IMO... so I think i am probably kind of hard on the synchros, so upgrading the tranny fluid isn't a bad idea, especially to a mixture that benefits the syncros - I do a lot of auto-x and track, and dont like not being able to downshift into 1st without double clutching/rev matching. Other than all this, the gearbox is pretty notchy, but I thought that was just the way WRXes are.



Now to the point of this post.

I've never changed either the tranny or rear diff fluid on any car... is it easy to do? The rear diff sounds fairly straight-forward, but wasnt too sure about the tranny fluid.

Also, do you have to flush it out (as in pour oil in and drain it immediately to remove excess dirt/metal fragments?) - I wasn't sure how necessary something like this would be. If there's an online walkthorugh on all this, I'd appreciate a link. I looked through the FAQs but didnt see anything.

Thanks.
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Old 07-02-2006, 10:37 PM   #2
willz23
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Scoobymods.com is probably the best place to look if you ever need instructions. The first time I changed the gear oil in the WRX I followed a tutorial through that website.

Overall changing the oil is relatively easy just search scoobymods and make sure you have all the tools before you proceed.
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Old 07-11-2006, 03:18 PM   #3
STIdrivr
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every how many miles should tranny and diff fluid be changed. Also is there clutch fluid that needs to be refilled, if so how often?
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Old 07-18-2006, 12:04 AM   #4
Durmiente
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i changed the tranny and rear diff this weekend. EASY! really glad i did it myself. car feels faster and shifts a bit better. i was long overdue for this, so thats why i saw an improvement.

only tough part was loosening the drain plug on the rear diff. filling the rear diff was challenging till i discovered a usefull technique of squirting the oil in there. glad i finally got around to this :-D
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Old 07-18-2006, 12:09 AM   #5
kickitjp
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It's changed every 30,000 I think. For easier rear diff. oil changes, go to a vet shop and buy a horse syringe (a big one...like 50ml or 100ml). It'll make it a hell of a lot easier, and its friggin cheap. Some gear oils though, come in bottle that are 'squirt' friendly (I think the Mobile1 does)

PS. the rear diff bolt is a bitch to get out. Don't strip it. If you're hesitant on stripping it, take it to the dealer for them to change it out.
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Old 07-18-2006, 01:56 AM   #6
obsidian06
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Sometime during the '04 production run, they switched plugs from a 1/2" wratched drive to a T70 Torx plug. If you have an '02/'03 you should be fine, but if you have '04+ then you may/will need the Torx driver. I had to get mine from ebay, because no one......I mean NO ONE......had the tool that I needed.
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Old 07-18-2006, 08:37 PM   #7
Durmiente
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Quote:
Originally Posted by kickitjp
Some gear oils though, come in bottle that are 'squirt' friendly (I think the Mobile1 does)
yep. i used mobile 1 synthetic in the rear diff. Basically, I took the bottle and rapidly moved it up and into the top plug (forcing the liquid to the top of the bottle) and squeezing at the same time to spray it in... then towards the end I just crunchged the bottle up against the sway bar and tilted it as much as possible... like i said, it was really easy once i developed this technique. i would have bought a pump or syringe, but i will be doing this so in-frequently that it really doesnt pay to get the added convenience. I estimate the next change (30k) will be in 3-4 years as i dont put much mileage on the scooby.
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Old 07-18-2006, 10:56 PM   #8
sgrassbaugh
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Default Uncle Scottys

Be sure to use uncle scotty's cocktail for the transmission fluid/front diff. Makes a big difference!
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Old 07-19-2006, 10:12 AM   #9
ryguy
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Get a transmission funnel, it helps to get around the IC. Also one with a shutoff valve is very nice. With caps at both ends to keep dust and water out.

Scottys cocktail is also a nice plus. I've had it in for 20k and love it.
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Old 07-19-2006, 02:39 PM   #10
STIdrivr
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Is the tranny fluid the container that is to the right and under the intercooler on the 04 STI or what is it? I cant really see what it says on the yellow cap but I think it says use DOT 3 fluid only.
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Old 07-19-2006, 03:00 PM   #11
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before draining the rear diff fluid be sure you can get the fill bolt out...
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Old 05-23-2007, 03:59 AM   #12
03STAGE2
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Quote:
Originally Posted by STIdrivr View Post
Is the tranny fluid the container that is to the right and under the intercooler on the 04 STI or what is it? I cant really see what it says on the yellow cap but I think it says use DOT 3 fluid only.

Oh no!..........! Take it to the shop. That is not your tranny fluid!
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Old 05-23-2007, 07:31 AM   #13
Uncle Scotty
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Quote:
Originally Posted by STIdrivr View Post
Is the tranny fluid the container that is to the right and under the intercooler on the 04 STI or what is it? I cant really see what it says on the yellow cap but I think it says use DOT 3 fluid only.
....d0000000000d......

Please....put the tools down and step away from the vehicle
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Old 05-23-2007, 07:33 AM   #14
Uncle Scotty
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Quote:
Originally Posted by Homemade WRX View Post
before draining the rear diff fluid be sure you can get the fill bolt out...
^^^^^^

ya GOTTA make SURE ya can get the UPPER plug out B-E-F-O-R-E ya take the LOWER one out ! ! ! ! ! ! ! ! ! ! !

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Old 05-23-2007, 01:29 PM   #15
STIdrivr
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Quote:
Originally Posted by Uncle Scotty View Post
....d0000000000d......

Please....put the tools down and step away from the vehicle
Lol I was just asking what the container was for. I didnt say I put any tranny fluid in there. So what is it for??
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Old 05-23-2007, 01:57 PM   #16
z
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I think that's the brake fluid reservoir, iirc.

Tranny gets filled right through the dipstick hole on top of the trans...Access from engine bay, not under car.
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Old 05-23-2007, 03:06 PM   #17
Uncle Scotty
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Quote:
Originally Posted by STIdrivr View Post
Lol I was just asking what the container was for. I didnt say I put any tranny fluid in there. So what is it for??
....ok.....we don't want ya to make any problems fer yerself, here.

ya got brake and clutch fluid reservoirs there.....do NOT mistake these for anything else
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