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WTB: Rear diff. JDM 3.909
- Thread starter Nabeel
- Start date
I have a rear diff ring & pinion assembly that came from a member in Europe. It's a direct swap with that from the 3.545 diff. I was planning to use it with an Evo 2 trans, but need to $ to get 16/2000 running again. If you have not already found out it's a rare item.
pauleyman
Well-known member
Might be easier to swap the front diff and rear output shaft inside the transmission.
pauleyman -- what you suggest has been the workaround option for most members with a JDM close ratio tranny. this is because the 3.909 rear diff is SO HARD to find. although changing the final drive of a usdm trans may be easier, it is not ideal and does not allow one to fully experience and appreciate the 3.909 rear diff mated to a JDM close ratio gearbox, which when used with an FP green, street strip 20g (like mine) or smaller turbo in a responsive gvr4/dsm, the result is a sweet set up for autocross, time trial and the street. I know at least two other local guys along with me who either run a JDM GVR4 RS/Evo1 or Evo3 trans with a 3.909 rear diff and these setups are a blast to drive.
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GSX_TC
Well-known member
I'm Soo jealous now. But how are those setups on the track though?
Nabeel -- it is NOT necessary to replace your transfer case if you change the final drive of the trans or the rear diff ring & pinion. however, it would be good if you reply with the tranny code of the JDM gearbox you plan to use. in most cases it starts with "w5m33..." and is stamped at the top of the bell housing. knowing the type of tranny you have helps to be sure you are after the correct rear diff.
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More questions for you:
1) Have you used the tranny? What car did it come from?
2) What car is this tranny going in?
3) How far along is the tranny installed in the car -- ie, are the transfer case, starter, axles and wheels attached already?
4) What starter plate did or are you planning to use, 1g or 2g?
5) If the axles are not yet in, look through the holes from both sides where the axles would normally go. Can you see through to the other side or does a cross bar appear?
Your answers will help to determine if there are more considerations that need to be addressed -- ie, it may not just be the 3.909 rear diff that's needed to get the tranny to work in your car.
1) Have you used the tranny? What car did it come from?
2) What car is this tranny going in?
3) How far along is the tranny installed in the car -- ie, are the transfer case, starter, axles and wheels attached already?
4) What starter plate did or are you planning to use, 1g or 2g?
5) If the axles are not yet in, look through the holes from both sides where the axles would normally go. Can you see through to the other side or does a cross bar appear?
Your answers will help to determine if there are more considerations that need to be addressed -- ie, it may not just be the 3.909 rear diff that's needed to get the tranny to work in your car.
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cheekychimp
Well-known member
Quoting ctm:
pauleyman -- what you suggest has been the workaround option for most members with a JDM close ratio tranny. this is because the 3.909 rear diff is SO HARD to find. although changing the final drive of a usdm trans may be easier, it is not ideal and does not allow one to fully experience and appreciate the 3.909 rear diff mated to a JDM close ratio gearbox, which when used with an FP green, street strip 20g (like mine) or smaller turbo in a responsive gvr4/dsm, the result is a sweet set up for autocross, time trial and the street. I know at least two other local guys along with me who either run a JDM GVR4 RS/Evo1 or Evo3 trans with a 3.909 rear diff and these setups are a blast to drive.
If you think a 3.909 setup is a blast to drive, you should try the rally spec 4.3 ratio transmissions ... SSSWWWEEEEEETT!!!
pauleyman -- what you suggest has been the workaround option for most members with a JDM close ratio tranny. this is because the 3.909 rear diff is SO HARD to find. although changing the final drive of a usdm trans may be easier, it is not ideal and does not allow one to fully experience and appreciate the 3.909 rear diff mated to a JDM close ratio gearbox, which when used with an FP green, street strip 20g (like mine) or smaller turbo in a responsive gvr4/dsm, the result is a sweet set up for autocross, time trial and the street. I know at least two other local guys along with me who either run a JDM GVR4 RS/Evo1 or Evo3 trans with a 3.909 rear diff and these setups are a blast to drive.
If you think a 3.909 setup is a blast to drive, you should try the rally spec 4.3 ratio transmissions ... SSSWWWEEEEEETT!!!
I have not and would jump at the opportunity to! How is it different from the "RalliArt spec" dog box trans, a couple of which (along with lots of spare parts) were being sold by Ramana (sp?) a while back?
Since the days when this forum was hosted in Yahoo groups, I can recall that there have only been a handful of true dog box trannies in the hands of forum members. I know of the two already mentioned above and two from a guy in TX who went incognito after bailing on a monster build on his BG GVR4. I recall it had a water cooled IC, Civic style radiator fitting within the upper and lower front supports so he had room for his huge turbo. It would be interesting to know what became of these? There were a couple of others who were close to one or both major US rally shops that built/campaigned Evo 1 - 3s.
Since the days when this forum was hosted in Yahoo groups, I can recall that there have only been a handful of true dog box trannies in the hands of forum members. I know of the two already mentioned above and two from a guy in TX who went incognito after bailing on a monster build on his BG GVR4. I recall it had a water cooled IC, Civic style radiator fitting within the upper and lower front supports so he had room for his huge turbo. It would be interesting to know what became of these? There were a couple of others who were close to one or both major US rally shops that built/campaigned Evo 1 - 3s.
ctm'
The JDM tranny & transfer case already installed & I am driving the car. The only problem I have is shifting issue at high RPM + the front wheels runs faster than the rears as I realized that when car was jacked & running.
Quoting ctm:
More questions for you:
1) Have you used the tranny? What car did it come from?
2) What car is this tranny going in?
3) How far along is the tranny installed in the car -- ie, are the transfer case, starter, axles and wheels attached already?
4) What starter plate did or are you planning to use, 1g or 2g?
5) If the axles are not yet in, look through the holes from both sides where the axles would normally go. Can you see through to the other side or does a cross bar appear?
Your answers will help to determine if there are more considerations that need to be addressed -- ie, it may not just be the 3.909 rear diff that's needed to get the tranny to work in your car.
The JDM tranny & transfer case already installed & I am driving the car. The only problem I have is shifting issue at high RPM + the front wheels runs faster than the rears as I realized that when car was jacked & running.
Quoting ctm:
More questions for you:
1) Have you used the tranny? What car did it come from?
2) What car is this tranny going in?
3) How far along is the tranny installed in the car -- ie, are the transfer case, starter, axles and wheels attached already?
4) What starter plate did or are you planning to use, 1g or 2g?
5) If the axles are not yet in, look through the holes from both sides where the axles would normally go. Can you see through to the other side or does a cross bar appear?
Your answers will help to determine if there are more considerations that need to be addressed -- ie, it may not just be the 3.909 rear diff that's needed to get the tranny to work in your car.
Ok, what transfer case is installed with your WQWK tranny (ie, what car did it come from)?
Also, you never mentioned what kind of car you installed them in?
Your tranny came with a LSD right (at least that is what its code indicates)? Was the LSD replaced, modified, or still stock? If stock (and presuming it's installed in a USDM GVR4), can you explain how you got around the anticipated front passenger side axle issue?
Also, you never mentioned what kind of car you installed them in?
Your tranny came with a LSD right (at least that is what its code indicates)? Was the LSD replaced, modified, or still stock? If stock (and presuming it's installed in a USDM GVR4), can you explain how you got around the anticipated front passenger side axle issue?
The tranny + transfer case from galant as at the last of the Cood is K from (WQWK) the rear diff is stock US Spec.(3.545)
web page
I did not understand the pass axle part? And I have no history about the tranny if has stock LSD. or welded. from the red color sealed it seems opened before.
web page
I did not understand the pass axle part? And I have no history about the tranny if has stock LSD. or welded. from the red color sealed it seems opened before.
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pauleyman
Well-known member
You're driving it this way? Your VC on the center diff is likely already toast and possibly the center also.
cheekychimp
Well-known member
Quoting ctm:
I have not and would jump at the opportunity to! How is it different from the "RalliArt spec" dog box trans, a couple of which (along with lots of spare parts) were being sold by Ramana (sp?) a while back?
Since the days when this forum was hosted in Yahoo groups, I can recall that there have only been a handful of true dog box trannies in the hands of forum members. I know of the two already mentioned above and two from a guy in TX who went incognito after bailing on a monster build on his BG GVR4. I recall it had a water cooled IC, Civic style radiator fitting within the upper and lower front supports so he had room for his huge turbo. It would be interesting to know what became of these? There were a couple of others who were close to one or both major US rally shops that built/campaigned Evo 1 - 3s.
I believe Alex at DSG had those two Ralliart dog boxes for a while but I have no idea if he still has them. I believe TRE also used to be able to build a short ratio box. Having never driven either, it is difficult to make a direct comparison. The most striking feature of this 4.3 transmission that I have is that it is only 1st through 4th that are close ratio with 5th being identical to the old 3.545 transmission so cruising on the highway is never a chore. I have heard the problem with the competition boxes was that they were limited to about 100 mph at 7000 rpms in 5th which meant cruising at highway speeds was annoying. That said 3.909 and 4.3 are only final ratios and are a product of primary and secondary ratios. Whilst this transmission is a blast the gears aren't as short as you might expect given that this is as big a jump again from 3.545 to 3.909. Consequently, I think the gear ratios themselves may be different to compensate. One day I will have to crack the thing open and see exactly what is inside and see if some even better ratios could be created. I could live with a bigger jump from 4th to 5th if I could make 1st through 4th even shorter.
I have not and would jump at the opportunity to! How is it different from the "RalliArt spec" dog box trans, a couple of which (along with lots of spare parts) were being sold by Ramana (sp?) a while back?
Since the days when this forum was hosted in Yahoo groups, I can recall that there have only been a handful of true dog box trannies in the hands of forum members. I know of the two already mentioned above and two from a guy in TX who went incognito after bailing on a monster build on his BG GVR4. I recall it had a water cooled IC, Civic style radiator fitting within the upper and lower front supports so he had room for his huge turbo. It would be interesting to know what became of these? There were a couple of others who were close to one or both major US rally shops that built/campaigned Evo 1 - 3s.
I believe Alex at DSG had those two Ralliart dog boxes for a while but I have no idea if he still has them. I believe TRE also used to be able to build a short ratio box. Having never driven either, it is difficult to make a direct comparison. The most striking feature of this 4.3 transmission that I have is that it is only 1st through 4th that are close ratio with 5th being identical to the old 3.545 transmission so cruising on the highway is never a chore. I have heard the problem with the competition boxes was that they were limited to about 100 mph at 7000 rpms in 5th which meant cruising at highway speeds was annoying. That said 3.909 and 4.3 are only final ratios and are a product of primary and secondary ratios. Whilst this transmission is a blast the gears aren't as short as you might expect given that this is as big a jump again from 3.545 to 3.909. Consequently, I think the gear ratios themselves may be different to compensate. One day I will have to crack the thing open and see exactly what is inside and see if some even better ratios could be created. I could live with a bigger jump from 4th to 5th if I could make 1st through 4th even shorter.
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