xbeerd Posted April 15, 2013 Share Posted April 15, 2013 (edited) Hi guys and gals, so im trying to help someone trouble shoot their car, its a 2002 WRX, after getting a trans installed, (JDM Trans, and rear dif with 4.11 FD, trans is stated to have 50k miles on it, came on a freight pallet from japan) he drives down the road and over time it'll develop a crazy bad vibration which will cause the car to shake pretty bad to the point you need to pull over and stop. afterwards, it seemed to go away. any idea what could cause this? the carrier bearing on the drive shaft seems kinda soft and has about half inch of play in each direction as i pushed on it. there is some fluid leaking from the trans, looks just like a rear output shaft bushing needs to be replaced. the trans has a Scottys Cocktail fluid mix in it. (or whatever its called), its not leaking TOO bad, looked like maybe 1/8th-1/4qt over the last day while parked on an uphill incline. i'd say 1/4qt is the very max loss over that time. any ideas on this? im hoping the dif and trans are not the culprit for his sake and since its a farily low mileage trans, before and after the vibration attack it seems to be ok, shifts a little rough (possibly due to the low fluid), but so does my EA82 D/R with 250k on it and its way worse than this guys wrx is, LOL i appreciate any info or ideas anyone might have to add. Edited April 15, 2013 by xbeerd Link to comment Share on other sites More sharing options...
bratman18 Posted April 15, 2013 Share Posted April 15, 2013 Did you use the original tranny mount and driveshaft? The one on the tranny possibly could have come from a different vehicle, like a Forester, and the angle of things could be off if that's the case. Link to comment Share on other sites More sharing options...
xbeerd Posted April 15, 2013 Author Share Posted April 15, 2013 I believe it was the original driveshaft to the car that was used, not sure about the trans mount. i'll pass the question along about the mount. Link to comment Share on other sites More sharing options...
Fairtax4me Posted April 15, 2013 Share Posted April 15, 2013 Mount should be the same, otherwise it wouldn't bolt to the trans or x-member. If the driveshaft is not perfectly straight it will make a terrible shake above about 20 mph, and you will have a rumble and shaky feeling when trying to accelerate. Make sure the center carrier did not get flipped upside down during installation. That would throw off the u joint angles and cause a serious vibration. Link to comment Share on other sites More sharing options...
Suzam Posted April 15, 2013 Share Posted April 15, 2013 (edited) I find it odd it comes in over time and not straight away. I had a 1995 Nissan Maxima that the lock-up torque converter would cause a horrific vibration. If I pushed the overdrive button in on the shifter would stop it instantly. It only did it after driving for 20 minutes or so. The next cold start it shifted fine until 20-30 minutes later. It had over 200,000 on the odometer, so I just drove it that way for 6 months then sold it for parts. Edited April 15, 2013 by Suzam Link to comment Share on other sites More sharing options...
bratman18 Posted April 16, 2013 Share Posted April 16, 2013 Mount should be the same, otherwise it wouldn't bolt to the trans or x-member. If the driveshaft is not perfectly straight it will make a terrible shake above about 20 mph, and you will have a rumble and shaky feeling when trying to accelerate. Make sure the center carrier did not get flipped upside down during installation. That would throw off the u joint angles and cause a serious vibration. Actually.........The mount doesn't have to be the same, for it to bolt up. I was speaking from experience in this situation. The Forester has a built in lift block in the transmission crossmember,that the Impreza doesn't have. If the JDM tranny came from a Forester, than it will still bolt up, and look fine, but in fact will not allow the transmission to sit at the correct height, and in turn, put a different angle on the driveshaft. I dealt with this for a while before I figured out what it was. Link to comment Share on other sites More sharing options...
ivans imports Posted April 16, 2013 Share Posted April 16, 2013 Awd center diff has expanded apart ? or wrong ratios or trany got rusty somehow inside or mainshaft berrings going out Link to comment Share on other sites More sharing options...
johnceggleston Posted April 16, 2013 Share Posted April 16, 2013 is the problem speed related or time / distance related? if speed related i would suspect the drive shaft or mount or other similar part. something is loose and speed agravates it. if it is distance related, after 10 minutes of city driving or 5 -7 miles it acts up, then i would suspect mis-matched ratios. especially for a manual trans with viscous coupling, runs fine until it heats up. spped will not make a difference except that it gets heated a little faster. i assume it is a manual trans. Link to comment Share on other sites More sharing options...
xbeerd Posted April 16, 2013 Author Share Posted April 16, 2013 would the outback sport have the same crossmember as the forester? he said he was pretty sure it was from an impreza. not sure if the OBS trans mount would cause issue like forester mount if the trans was from a obs Link to comment Share on other sites More sharing options...
torxxx Posted April 16, 2013 Share Posted April 16, 2013 (edited) Can you post what the tranny number is? I've looked over the 5MT chart and they didnt make many of the JDM 5MT turbo trannys as 4.11 FD. They mostly came on the 93-96 JDM WRX and then some of the 5 door 97-00 WRX. Majority of the newer ones are 4.44 Edited April 16, 2013 by torxxx Link to comment Share on other sites More sharing options...
xbeerd Posted April 16, 2013 Author Share Posted April 16, 2013 (edited) k, passed the question along. guess it would be good to verify that is indeed a 4.11 FD trans. im coming into this knowing nothing of the parts that were installed. so i had to assume everything was correct. Edited April 16, 2013 by xbeerd Link to comment Share on other sites More sharing options...
CNY_Dave Posted April 16, 2013 Share Posted April 16, 2013 I have had bad driveshafts or bad inner cv joints have a wicked vibe that would come and go. Link to comment Share on other sites More sharing options...
xbeerd Posted April 17, 2013 Author Share Posted April 17, 2013 (edited) you can listen here. the tranny is ty754vbbca i found a tranny list/doc, but that didnt include the FD for that one but a few ebay items show it as 4.11 Edited April 17, 2013 by xbeerd Link to comment Share on other sites More sharing options...
xbeerd Posted April 17, 2013 Author Share Posted April 17, 2013 someone else in the facebook group he and I are a part of mentioned that center dif might be problematic same as ivan did here. anyone have any thoughts on the video? can the center dif be swapped with trans stil lin the car (sounds like a pain in the rump roast) Link to comment Share on other sites More sharing options...
ivans imports Posted April 17, 2013 Share Posted April 17, 2013 Have never done one in car as it only takes me 35 min to pull it out have you pulled the drian plug and looked at the magnet for debries thiss can tel you alot when center diff is bad i find bitts of the snapring from awd clutchpack on magnet Link to comment Share on other sites More sharing options...
Gloyale Posted April 17, 2013 Share Posted April 17, 2013 Jack up one side of car so both wheels on one side are off the ground. Put it in neutral. Mark a hash on each tire straight down to the ground. Then rotate one tire by hand, while watching the other tire. Make sure they both rotate the same amount. If you have a LSD rear end, you will need both back tires off the ground to do this. Link to comment Share on other sites More sharing options...
bratman18 Posted April 18, 2013 Share Posted April 18, 2013 would the outback sport have the same crossmember as the forester? he said he was pretty sure it was from an impreza. not sure if the OBS trans mount would cause issue like forester mount if the trans was from a obs No, the OBS has the no factory lift, so it has the same tranny crossmember as an Impreza. Gloyale has a good suggestion too. Simple and easy way to check. Link to comment Share on other sites More sharing options...
xbeerd Posted April 19, 2013 Author Share Posted April 19, 2013 so what does Gloyales test do? lol test the center dif function? Link to comment Share on other sites More sharing options...
bratman18 Posted April 19, 2013 Share Posted April 19, 2013 so what does Gloyales test do? lol test the center dif function? Make sure the front and rear gear ratios are the same. Link to comment Share on other sites More sharing options...
xbeerd Posted April 21, 2013 Author Share Posted April 21, 2013 Oh gotcha. That's what I figured. Well the trans checks out for a 4.11 as far as I can tell from searching the net. The front wheel made one rotation. The rear wheel made what looked like 3/4 rotation ( or 1.25 if went the other way) Link to comment Share on other sites More sharing options...
Gloyale Posted April 21, 2013 Share Posted April 21, 2013 Oh gotcha. That's what I figured. Well the trans checks out for a 4.11 as far as I can tell from searching the net. The front wheel made one rotation. The rear wheel made what looked like 3/4 rotation ( or 1.25 if went the other way) Repeat the test. If you can't get them to turn 1:1 then there is a mismatch in the diff. Definately repeat the test until you have consitant results. Weren't there some JDM trans that used non- 1:1 transfer gears? Link to comment Share on other sites More sharing options...
xbeerd Posted April 21, 2013 Author Share Posted April 21, 2013 it wasnt a full 1/4 rotation off, he spun the wheel a few times. i believe there was a 1.1:1 transfer ratio, but those all seemed to be cars having a 3.9 Final drive. on this chart.. http://www.gearhack.com/myink/ViewPage.php?file=docs/Subaru%20Transmission%20Chart all the JDM trans with 4.11's have 1:1 or have nothing listed. Link to comment Share on other sites More sharing options...
johnceggleston Posted April 21, 2013 Share Posted April 21, 2013 (edited) i don't know a lot about the center viscous coupling, but i would suggest you do the test when the transd is hot. you want the viscous coupling to be really grabby. you might rotate one tire when only one is in the air. once the VC starts to grab then lift the other tire. also, the difference between 4.11 and 4.44 is about 8%. so 12 rotations might make the tires end up in the same location. but 6 rotations should make one tire 180 degrees off. if the ratios are different. Edited April 21, 2013 by johnceggleston Link to comment Share on other sites More sharing options...
Gloyale Posted April 22, 2013 Share Posted April 22, 2013 (edited) The VC should hold more than tight enough for this test, without any spinning. If you want to get a sense of the grip it has jack up only one tire, and then try to spin it. You might be able to budge it a little if you strain. I am thinking that this trans has a 1.1:1 transfer ratio, and should be paired to a 3.7 rear diff. On the upside, the gearhack chart shows this to be the Helical LSD variant of the 02 Legacy GT-B 5 spd. Edited April 22, 2013 by Gloyale Link to comment Share on other sites More sharing options...
torxxx Posted April 22, 2013 Share Posted April 22, 2013 and yes gloyale the JDM tranny varied between the 1.1:1 and the 1:1. it was year specific from what I've researched. 02-05 only JDM had 1:1:1 or something like that. rest of them were 1:1 Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now