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Old 10-02-2014, 05:18 PM   #1
sunyster
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Default 5 Speed Transmission Swap! Need help!!

Hi,

The 2nd gear on my 5 speed 2004 WRX 2.0LT chipped a tooth the other day (all other gears are fine, 2nd gear still driveable, but i've been skipping 2nd if I need to move the car) and after looking around and getting some recommendations, I figured it would be best to just do a transmission swap. I have a question and would welcome further guidance.


I recently found an ad that had a "5 speed transmission wrx 02-05" that was imported from japan. I asked if I would be able to do a straight up swap with the transmission he was selling, and he said I would be able to but my gear ratios are different from the transmission that is available. He stated that the gear ratios for mine is 3.9 and the one selling is 4.4. I provided my transmission type to him later on I asked for the type he was selling. I looked it up and found that the transmission type that he is selling is for does not show 02-05 wrx.

Would this swap be possible? What options do I have? I am scheduled to pick it up this Saturday but would like to make sure that this would be possible.

My transmission type is TY754VV4AA
Transmission type of the seller is TY754VB1AA

Reference I used: http://www.gearhack.com/myink/ViewPa...smission+Chart

Thank you guys so much! I apologize for the long read
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Old 10-02-2014, 06:36 PM   #2
Bikelok
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Yes it will swap in, but the final drive does not match your car.
You would need the rear differential for that transmission, or change your current ring and pinion to match.

Your transmission: TY754VV4AA
USDM WRX 02-early 04
Final drive 3.90
1st - 3.45
2nd- 1.94
3rd- 1.36
4th- 0.97
5th- 0.73

The other transmission: TY754VB1AA
JDM WRX 99-00
Final drive 4.11
1st - 3.45
2nd- 2.06
3rd- 1.44
4th- 1.08
5th- 0.82

I hope all this transferred over correctly.

Good luck.


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Old 10-03-2014, 02:04 AM   #3
sunyster
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Thank you so much Bikelok!! Would you recommend this swap? I am able to get this tranny for ~ $600. Would the drive be much different? Once again, thank you!
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Old 10-03-2014, 02:31 AM   #4
ImprezaLover94
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It's not just an easy swapping of the transmission. You would also need to change the ring and pinion gears in your rear differential or use a rear differential that is stock on that one (which also may require new axles or more). Just swapping the ring and pinion in yours could cost $200-300 in parts, plus the cost of labor unless you know how to.

Also, your final drive ratio is 3.90 but the ring and pinion in your rear differential is 3.54. How they end up at 3.90 final is from the 1:1.1 gears in the center differential of your transmission. The key is making sure that your front and rear differential match with final ratios.
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Old 10-03-2014, 05:06 AM   #5
Bikelok
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Default 5 Speed Transmission Swap! Need help!!

Quote:
Originally Posted by sunyster View Post
Thank you so much Bikelok!! Would you recommend this swap? I am able to get this tranny for ~ $600. Would the drive be much different? Once again, thank you!
As Imprezalover94 and I said, you have to make sure that the final drives match.
Otherwise, yes that is a very good transmission. I really like the ratios, but you will notice a bump in RPM at freeway cruising speed.

If its in good shape $600 is a good price.

Oh, and I believe the 02-05 automatic WRX had a 4.11 differential. So you can research that and if it does, you can find one of those easily to compleat the swap.

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Old 10-03-2014, 06:50 AM   #6
Max Capacity
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Why not rebuild yours ?

Look at the over all cost and what your plans are for the car.
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Old 10-04-2014, 11:12 PM   #7
Uncle Scotty
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this IS CONFUSING!!!!


the usdm 2.0 5mt trans had a 1.1:1 stepper in the tailcase.....

so....the r&p in the trans does NOT match the r&p in the rear end!!!!!!!

many of the jdm 5mt transmissions did NOT have the 1.1:1 stepper !!!!!

and its very complicated unless and until you find the chart somebody so LOVINGLY made that lists all these wonderful details

you can NOT swap ANY trans that has a 4.11 or 4.44 ratio straight swap into any 5mt usdm wrx
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Old 10-05-2014, 03:12 AM   #8
ImprezaLover94
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Here is the chart Uncle Scotty is probably referring to:
http://www.gearhack.com/myink/ViewPa...ission%20Chart
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Old 10-05-2014, 04:42 AM   #9
sunyster
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Thanks for the response and information ImprezaLover94, Uncle Scotty, and Bikelok. What would happen if the tranny was swapped without the rear differential that matches? So just to verify, it seems that I would need the rear differential for the transmission with the 4.11 ratio to make a swap. Would I need any other parts for this swap? Thanks so much!!
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Old 10-05-2014, 05:28 AM   #10
Uncle Scotty
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Quote:
Originally Posted by sunyster View Post
Thanks for the response and information ImprezaLover94, Uncle Scotty, and Bikelok. What would happen if the tranny was swapped without the rear differential that matches? So just to verify, it seems that I would need the rear differential for the transmission with the 4.11 ratio to make a swap. Would I need any other parts for this swap? Thanks so much!!

the center diff...at LEAST...would die very quickly

you MUST not as in can NOT swap ONLY(the trans) or the other(the rearend) gear

as far as parts....the trans and rear end and whatever breaks when you take it apart
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Old 10-05-2014, 05:53 PM   #11
Bikelok
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Quote:
Originally Posted by sunyster View Post
Thanks for the response and information ImprezaLover94, Uncle Scotty, and Bikelok. What would happen if the tranny was swapped without the rear differential that matches? So just to verify, it seems that I would need the rear differential for the transmission with the 4.11 ratio to make a swap. Would I need any other parts for this swap? Thanks so much!!
Like I posted earlier, you would need the matching differential, or replace your current ring and pinion. That's all you need to do. Perhaps think about a new clutch while its all apart.

I also said that although I'm not certain, but I think the USDM WRX automatic differentials were 4.11. If that's correct it would be very easy to source one and swap that in. Research this and confirm.

As the the great Uncle said, you will break the center diff at the very least if you don't match the final drives. You have to match!


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Old 10-05-2014, 08:16 PM   #12
sunyster
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Uncle Scotty, Bikelok, and ImprezaLover, thank you guys so much. I'll be picking up the rear diff to match to complete my swap. I will also be replacing my clutch as recommended. Thank you guys for the advice!
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Old 01-12-2015, 04:40 PM   #13
sunyster
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Hi guys, after swapping my tranny and rear differential, everything shifts smooth and feels good up until 60+ mph. When the car reaches 60+mph the car begins to shake violently (coming from the rear right) once I release the pedal, and is gone when I accelerate or come to a complete stop. I have tried changing my driveshaft, rear axles, and different rear differential, but the vibration is still present.

I have tried researching online as well and found a video that sounds pretty much like my situation. Here is the link to the video: https://www.youtube.com/watch?v=Sqr8...ature=youtu.be

any help would be greatly appreciated!
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Old 01-12-2015, 05:58 PM   #14
Wrxtuner251
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1st
You said it becomes violent at 60+mph how does it feel at 1 to 59 mph you said good, any noises or grinding? Does it come and go at any other speed below 60, have you tried veering the car left and right at 60 to see if a noise or condition becomes better or worse?

Here is a list of things that cause vibration at speed

Really bad wheel bearings "loud howling bad"
Mis matched tires "IE 215/45/17 on one side 235/50/17 on the other " or overly worn tires has to be worn bad almost bald on one side, new on the other side.
Tires are out of balance "would try rotate and re-balance to see if the vibration moves with the tires"
--
Drive line vibrations

Drive shaft out of balance
Bad bearing or "bearings" in either the transmission or Differential
Installing the drive shaft wrong "Some drive shafts have to be installed in the correct location usually corresponding to a mark somewhere on the differential yolk and transmission" although i don't know if Subarus are this way the drive shaft can either be 180 degrees out, or 180 degrees in "upside down or rightside up"
CV shaft is broke inside a boot "rare"


Also when you installed the differential did you check the torque on the yolk nut?
Did you pop the cover on the differential and look at the ratio marking on the ring gear to make sure it match's the transmissions ratio "a little math is involved search the forum should be on here how to calculate the numbers you will find"

The video you listed i hear grinding in it which isn't good is yours grinding as well?

I personally installed a 5 speed tranny and diff swap from a legacy gt spec b in my own car to get the 4.11 final drive ratio. Had some small vibration problems but turned out to be tires out of balance and a bad wheel bearing.

In short a vibration is a problem with balance somewhere in the drive-line or wheels look at all parts that rotate closely anyone could be the problem.
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Old 01-12-2015, 08:34 PM   #15
sunyster
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Hi Wrxtuner251,

Thank you for the quick response. There aren’t any particular noises from 1 to 59 mph. I did however notice a few times that at around 25mph in 2nd/3rd gear when i got on the gas there was a slight grind, but it was very difficult to recreate when I tried to. When veering left/right on the highway, the vibration is still present. I did notice that when I put the car in neutral or clutch in, the vibration sound is just as loud as the vibration when I let off the gas.

My mechanic has put the car on the lift to diagnose the vibration, but without load it was hard to tell where it was coming from. There is a howl or whirring noise at high speeds that we thought was coming from the wheel bearings, but we pinpointed it to the rear differential. I have tried swapping it with another rear differential that was supposed to be matching with the transmission. (The vendor that I picked up the tranny from also sold me the two rear differentials that I tried. Supposedly those are the only tranny and diffs that they received from japan so they should be matching) You mentioned that the bearing from the rear differential may be bad, there may be a chance that they were both bad. so my next move will be to try another diff from another.

My tires have recently been balanced and rotated. We tried rotating the driveshaft as well to see if that would fix it.

I am unsure of the the torque of the yolk nut (would that cause the weird whirring sound?)
I haven’t popped the cover of the differential, I was told it could mess up the rear diff if I did. (Is that true?)

The vibration that I hear from my car is more of a slap or knock of something hitting in the right rear which then vibrates the entire rear.

I’ll show your comment to my mechanic and hopefully that’ll help him think of anything we haven’t done yet. Thank you so much.
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Old 01-13-2015, 11:40 AM   #16
Wrxtuner251
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Based off what you are telling me it seems that the problem is rear differential based, it is either a bad bearing, the blacklash hasnt been set correctly on where pinion gear meets the ring gear "not to likely though" or a wrong ratio diff.

First who ever told you popping the diff cover off can mess it up is just plain wrong. The r160 diff is very strait forward nothing fancy.

Knowing this:
Mark the location of the Drive shaft on the yolk "optional"
Disconnect the drive shaft
Place a pan underneath diff toward the rear
Drain the diff, unscrew the lower plug "not the upper one"
Then pop the cover, when removing the cover there is a gasket between the cover plate and the Diff housing don't loose it "sometimes is stuck to the plate or diff housing"
Check the gear oil and bottom of the diff housing for loose metal partials, some ultra fine partials are ok should be accumulated on the lower plug "its magnetic" but if your oil looks like the milky way galaxy then somethings bad.

Determining the ratio:
On the ring gear the "Big round gear with teeth" look for the numbers, may have to rotate the tires in the rear some to turn the ring gear so you can see the numbers. "they are etched on the ring gear"

This is were some math is involved to find out the ratio. ""Found it"" ""Also, you can verify the ratio by turning the ring rear until you see some numbers. Just do the math. 39:10 -> 39/10=3.9 39:11 -> 39/11=3.545 etc."" from one of my old posts thanks kpluiten!! simple division ftw lol

The yolk nut aka "pinion flange nut" should be 135 to 140 ft-lbs

Last edited by Wrxtuner251; 01-13-2015 at 12:08 PM. Reason: New info
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Old 01-14-2015, 03:47 PM   #17
sunyster
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Thank you so much Wrxtuner251 for all the information you provided me. I'll take a look and show my mechanic this as soon as I can!
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Old 01-23-2015, 04:06 PM   #18
sunyster
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UPDATE: the rear diff had the wrong ratio...shop that sold it to me told me they only have 4.11s that matched the tranny they sold me. I was able to locate a 4.11 that comes from a 2001 2.5 rs. Would that fit with my stock 2004 axles? The 4.44 seemed to fit in my car.
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Old 02-09-2015, 03:10 PM   #19
Rex34v
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Any update with you project ?
I plan on swapping my 03 trans into an 04 cuz I got in a wreck
Any tips ?
other than the ratio an stuff did you run into anyother problems ?
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Old 02-09-2015, 05:17 PM   #20
sunyster
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Quote:
Originally Posted by Rex34v View Post
Any update with you project ?
I plan on swapping my 03 trans into an 04 cuz I got in a wreck
Any tips ?
other than the ratio an stuff did you run into anyother problems ?
No other problems. Importer shop sold me the wrong rear differential...they kept ensuring me that it was the right rear diff. It wasn't until my mechanic and I opened the rear diff that we found it was the wrong ratio. The shop made me run around trying different things. I ended up purchasing rear axles, driveshaft, and rear diff that they won't even refund or credit me despite assuring me that i can return any parts if they dont work out. If you guys are in SoCal, do not purchase from LA JDM.

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Old 02-09-2015, 07:10 PM   #21
Osakel2013
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I;m just posting dont owrry
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