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Old 03-08-2020, 11:49 AM   #1
ScubaruImpreza05
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Default 5mt differences?

Simply put, are all 5mt from 2003 to 2011 the same? Wiki says it is called the Revised 5MT and I have an 06 2.5i with a dying center differential, and it seems more cost effective to just buy a used trans and swap it in.

Can I swap any of these years in and it wouldn't mess anything up? I read somewhere the 5mt from 06 - 07 have different ratios, but would it matter than much if I swapped in say an 09 trans? This is for a weekend rallycross car, not a primary driver.

Thanks.

FYI I did run through the pertinent faq and they were educational but just want to confirm whether or not the supposed different ratios matter with the rear differential.
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Last edited by ScubaruImpreza05; 03-08-2020 at 11:56 AM.
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Old 03-08-2020, 12:30 PM   #2
Blktrax
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Default

The Final Drive Ratios, and Transfer Ratios make ALL the difference between nuking the diff and trans or not. I've literally seen rear diffs catch fire from wrong transmissions swapped in.

The Gear set ratios make no difference.

Also- Variations in if the trans has Vehicle Speed Sensor, (VSS) nor not. '08-and later went to ABS, no sensor in the trans.

Variations in Front axles Female (roll pin style Usually '04 and earlier) or Male (clip in) axle interface.

Here's the chart with the Trans codes
https://rallispec.com/downloads/Tran...art_Public.pdf

Bottom of the list you should have a TY754VC7AA , 3.900 FINAL, with a 1.000, Transfer = Only other on the list similar would be 05-07 LEGACY, {forester and outback WILL NOT WORK UNLESS swapped with the matching Rear Diff assembly.}

Last edited by Blktrax; 03-08-2020 at 12:43 PM.
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Old 03-09-2020, 11:39 AM   #3
ScubaruImpreza05
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Default

Quote:
Originally Posted by Blktrax View Post
The Final Drive Ratios, and Transfer Ratios make ALL the difference between nuking the diff and trans or not. I've literally seen rear diffs catch fire from wrong transmissions swapped in.

The Gear set ratios make no difference.

Also- Variations in if the trans has Vehicle Speed Sensor, (VSS) nor not. '08-and later went to ABS, no sensor in the trans.

Variations in Front axles Female (roll pin style Usually '04 and earlier) or Male (clip in) axle interface.

Here's the chart with the Trans codes
https://rallispec.com/downloads/Tran...art_Public.pdf

Bottom of the list you should have a TY754VC7AA , 3.900 FINAL, with a 1.000, Transfer = Only other on the list similar would be 05-07 LEGACY, {forester and outback WILL NOT WORK UNLESS swapped with the matching Rear Diff assembly.}
Awesome, good to know! I had seen on a Subaru used parts site the 06-07 numbers were different than before years and after which sort of tipped me off.

I appreciate this greatly!
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Old 03-09-2020, 11:48 AM   #4
Stretch18
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There's some good info here:

https://www.rallispec.com/gea_syn_rst1140_t.html

Quote:
How does this compare to the stock WRX gears? Subaru has increased the strength of the standard gears used in the USDM WRX models over the years so it really depends on the model year used for comparison. The Type STi and Type RA gear sets are factory based gearset options that we pieced together into a complete kit and improved on with the REMŽ superfinishing process. When we first introduced these kits the 2002 WRX was the current model and these sets were a fairly substantial improvement for the weak standard gearbox. As the years progressed the strength difference became progressively less. With the introduction of the Legacy GT gearbox and later the MY2008 WRX (which had the same gears as the Legacy GT) the primary difference between the Type STI and the factory gears became simply the superfinishing process.

In terms of specific numbers the percentage increase in strength looks approximately like this for MY2002 WRX vs. Type STI/RA based on tooth size and surface treatment benefits: 1st = 15-20% increase, 2nd = 33-38% increase, 3rd = 42-47% increase for RA / 28-33% increase for STI, 4th = 5-10%, 5th = 5-10% although sometimes in extreme cases 5th gear will fail by splitting from the base of the tooth to the inside diameter of the gear and the RA gear has much greater material thickness here. In comparing MY2003 to MY2007 WRX the difference in 1st, 2nd, and 3rd is reduced noticeably becoming: 1st = 10-15% increase, 2nd = 17-22% increase, 3rd = 35-40% increase for RA / 15-20% increase for STI. In comparing MY2008+ WRX the difference becomes only the surface treatment which we estimate somewhere in the 5 to 10% range. The only exception being that the RA 3rd gear will provide an additional 10% due to its larger tooth pitch.
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Old 01-11-2021, 02:44 PM   #5
NiemanJZ28
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Default 08' Subaru outback transmission Final transmission ratio?

Hello,

New and need some help!

Where do I find the correct Outback transmission code list and final drive (FD) ratio?

How to confirm my current outback LL Bean 3.0 H required FD ?

Rear end differential has a code stamp..?

Car Vin. 4S4BP86C984328117

Trans Code: TG5D7CVDBA-UW ...has the Si-Drive 3 position knob on the console. Getting a turbine speed fault in the transmission code

I found a JDM trans on E-Bay TG5C7CVDBA all gears are matching a code chart I found off of NASIOC ....EXCEPT the FD ratio

Need answers ASAP, thx for the support!!

Joe
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Old 01-13-2021, 09:52 AM   #6
Unabomber
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https://forums.nasioc.com/forums/sho....php?t=2931575 has some rear diff codes

Search on cars101.com for your year/model as that usually has ratios.
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Old 01-16-2021, 10:37 AM   #7
CaptainSlowbaru
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Quote:
Originally Posted by NiemanJZ28 View Post
How to confirm my current outback LL Bean 3.0 H required FD ?
You have a 3.272 FD
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Old 01-18-2021, 06:57 PM   #8
NiemanJZ28
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Default

THANKS!!

I did a manual check as well ....10 full turns of the rear tire in neutral resulted in ~31 turns of the driveshaft so a low 3.1 ish reading .....close to the 3.273 ratio.

How to decode the original transmission code TG5D7CVDBA

I can find a JDM TGC7CVDBA is this a equivalent swap? Only difference is D Vs. C..?

Looks like the 5 transmission gear ratios are correct 1/3.54, 2/2.264, 3/1.471, 4/1.0, 5/0.834 and FR of 3.273

Note factory trans has harsh shifts and is getting a turbine sensor fault but I believe only replacement is a Vbody at $900.00+ so a JDM swap is low miles and hope it is a proper match. Does the Si-Drive bring in any other issues to check on with the JDM trans..?

Again THANKS!!!

Joe
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