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Old 08-02-2004, 01:49 AM   #1
ryceracerx
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Default 99 RS EJ207 Violent Shaking Tranny HELP

I have just finished my 99 2.5 RS with a JDM EJ207 motor and tranny. Everything is flawless except when i get on the highway and after about 15 minutes in any gear, about 50 mph the transmission starts shaking violently in or out of gear. Im still running the stock rear diff. Oil, axles, and driveshaft are good. It continues to shake or vibrate roughly untill i come to a complete stop. When i take off again its good untill about another 15-20 minutes of driving and the shaking comes back. Does it have anything to do with the non turbo rear diff? Anyone have any ides??? Suggestions?
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Old 08-02-2004, 02:53 AM   #2
ImprezaRSfan!
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can u feel where its coming from? are u sure its the tranny and not driveshaft or rear end? have a friend sit in the trunk and have him feel for any vibration coming from the rear so u can narrow it down
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Old 08-02-2004, 03:06 AM   #3
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You said you are running the stock rear diff. And you also said you are running the jdm motor and tranny. I'm going to assume for a minute that you mean 6-spd. If not then i have no idea, but you cannot run the stock rear diff with the 6 spd. Or i think even jdm 5spd, are all 3.9. I could be wrong but i think this is your problem.

-Brendan
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Old 08-02-2004, 07:46 AM   #4
bigdweeb
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Even if you are running an RA gearset, your ratios would be mis-matched. The RAs have a final drive of 4.44 and your RS would be setup for a 4.11 final drive (unless you started with an auto). I'd guess you are overheating your center diff because you are running the front and back at different speeds. If that's the case, I'm actually kinda surprised your drivetrain would take that long to get pissed of at running 2 different speeds.
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Old 08-02-2004, 11:21 AM   #5
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yup i concour .. sounds like a cooked center diff
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Old 08-02-2004, 12:48 PM   #6
ImprezaRSfan!
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i thoguht if u had a 3.9 tranny and 4.1/4.44 rear end you would hear a violenltly loud clanking noise right hwen u start to drive off, not at 50+ mph over 20 minutes.
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Old 08-02-2004, 01:11 PM   #7
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It may get worse as everything heats up and starts to bind, but who knows he hasn't said what kind of rear diff he's using exactly.
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Old 08-02-2004, 04:08 PM   #8
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Well i believe its a 99 Spec EJ207 with a 5 speed. My car is a 2.5 RS which came 5 speed and thats the rear diff im running now. Its not a sti or a RA. I think its a regular WRX motor. I checked out the vins and it determined to be a EJ207 with the VF22 turbo and the offset coilpack on the manifold. The manifold is not red or anything. Well the shifter itself shakes alot and thats why im assuming its the tranny. Yeah it seems to be when i run the car a little harder, that is when it happens. If i coast at like 30-40 mph driving very granny like, it does not seem to happen as often. Like i stated before its the JDM motor and tranny but with my stock 2.5 RS Rear diff. I havent driven it too much since. If the center diff did go bad, does anyone know if i can replace the internals of the tranny with 02 WRX tranny parts? Or a place to find a used jdm GC8 Tranny? Thanks everyone.

Last edited by ryceracerx; 08-02-2004 at 04:17 PM.
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Old 08-02-2004, 04:15 PM   #9
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yupp, you've got the final drive all buggered. You need to determine what your front diffs FD is and match the rear to it, and replace your center diff cus its toasted...
Also, If the motor came with the 5spd attached, silver Intake manifold, coilpack ontop of the manifold, you most likely do not have a 207 block.
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Old 08-02-2004, 04:15 PM   #10
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Well, the motor doesn't matter. We are only concerned with which tranny it is. And it sounds to me like you have a JDM 5-speed which over in japan seems to come with the r180 rear diff. Again this could be speculation, but if i am right, then you will have to buy a rear diff that has a 3.9 rear final drive ratio. These can be found in a local junk yard, 91-92' legacy turbo, (some even have lsd's) or any old school impreza obs i believe.

Just hope that your stock rear diff 4.11 final drive ratio is the only thing that was ruined and nothing in your tranny.

-B
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Old 08-02-2004, 04:20 PM   #11
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Quote:
Originally Posted by Mumbles
Well, the motor doesn't matter. We are only concerned with which tranny it is. And it sounds to me like you have a JDM 5-speed which over in japan seems to come with the r180 rear diff. Again this could be speculation, but if i am right, then you will have to buy a rear diff that has a 3.9 rear final drive ratio. These can be found in a local junk yard, 91-92' legacy turbo, (some even have lsd's) or any old school impreza obs i believe.

Just hope that your stock rear diff 4.11 final drive ratio is the only thing that was ruined and nothing in your tranny.

-B
just getting his facts straight,
also the rear diff most likely will not have fried, its not being put under any stress, its being given power, and it transfers it to the wheels.
The center diff however is being "rotated" at different shaft speeds on both ends. NOT good
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Old 08-02-2004, 04:26 PM   #12
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Actually i think most jdm 5mt are stil r160's. Mostly the sti's (which his isn't) v5/6 had the option of r180's. Anyway sounds like you have a v3 motor with the vf22. That means the standard spec tranny is a 4.11 nonetheless, i believe. Looks like your problem may lie elsewhere, how long have you had the swap in and how long has this problem been going on.
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Old 08-02-2004, 04:32 PM   #13
ryceracerx
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So does nyone know a good way to tell what final drive I have? I am able to get a JDM rear diff but does anyone know if there are markings on it to know what its from or the ratios? The shaking only happened 4 times and everytime i pulled over right away. Im hoping i can just get a matching rear diff and the center diff is not toasted yet. I think its best to try slappng in a JDM rear diff "supposedly" from the same JDM car and see what happens.
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Old 08-02-2004, 04:36 PM   #14
Soon2Bgreat
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http://www.catherineandken.co.uk/sti/wrx.html
Find out what year or model engine and tranny you have. This will help you find it. Most likely you have a 4.11.

You can easily tell by taking the cover off the rear diff. also and looking at what the number says.
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Old 08-02-2004, 04:40 PM   #15
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According to this, Version 1-3 STis had 4.111 final drive, and version 4-6 have 4.444 final drive for 5 speeds. If you don't have an STi drivetrain, I'm not sure... don't know if JDM WRXs have the same gearing for the given year. I'd say look on your transmission for a casting or sticker for the model number and see if someone can look it up for you. That way, you could at least figure out the drive ratio.
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Old 08-02-2004, 04:41 PM   #16
ryceracerx
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Its a EJ20 5 speed with silver manifold, offset coilpack, Im assuming its like a 99 motor from pictures of JDM cars i've seen. Well let me know what you guys think it is. From wire diagrams, it matches up "mostly" to the version 5 diagrams. I was also able to reconnect the test connectors and was able to pull codes from it when i needed to manually. I just finished the swap a few days ago. Drove it a few times around the block and it was great. First encountered the problem when i got on the highway and cruised for like 15 minutes. Then I pulled over and checked the oil.. All good so i took off again and it was fine for another 20 minutes about, stopped and then took off again to the next exit my house. Checked for anything loose and oil again and everything seemed good. Local traffic no problems. Jumped on the highway one more time very slow and no problems untill i got on it a little , then it happened again. Ever since that 3rd time. its been sitting in the driveway of my house. So what do ya think?
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Old 08-02-2004, 04:45 PM   #17
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Quote:
Originally Posted by ryceracerx
Well i believe its a 99 Spec EJ207 with a 5 speed. My car is a 2.5 RS which came 5 speed and thats the rear diff im running now. Its not a sti or a RA. I think its a regular WRX motor. I checked out the vins and it determined to be a EJ207 with the VF22 turbo and the offset coilpack on the manifold. The manifold is not red or anything. .
So...what were the vin numbers you can use those to find what tranny you have. Can you look on the bellhousing to get a tranny number, should be on a white tag.
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Old 08-02-2004, 04:54 PM   #18
ryceracerx
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I remember when i had the motor out, there was a sticker on the timing belt cover near the bottom which has EJ207 on it as well. I got to jack up the car and look for the sticker or tag on the tranny now. So what about the rear end? Does that have a tag or marking on it as well?
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Old 08-02-2004, 05:13 PM   #19
Jaxx
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tag on the tranny (engraved)
right next to the starter

re: rear diff
no but if you had a 99 rs manual you have an open 4.11 rear

edit:
i stole this picture .. but you can see where the transmission SN is (upper right frame)

Last edited by Jaxx; 08-02-2004 at 05:19 PM.
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