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'06=3.90 fd
Jake--I did some research and the '06 STi transmissions are 3.90 FD
Re: '06=3.90 fd
yeah, but if it is for sure an 06 tranny they run a 1.1 to 1 reduction in the center diff witch makes the final drive at the rear diff a 3.545kleinkid wrote:Jake--I did some research and the '06 STi transmissions are 3.90 FD
mines an 04 trannyasc_up wrote:Ah ok. What year tranny do you have Jake?
90' legacy built ej257 gt30r 6spd r180 and brembos Bitches 402whp @22psi :D -sexy red
94' Impreza wagon AWD 2.2ltr rally wagon FTW!
94' Impreza wagon AWD 2.2ltr rally wagon FTW!
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'07 and '06 not '06 and '05 ?
Dan--Those charts look good. Thanks.
To verify--you are sure that the top chart is NOT for the '06 and the lower one for an '05?
Thanks, John.
To verify--you are sure that the top chart is NOT for the '06 and the lower one for an '05?
Thanks, John.
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http://forums.nasioc.com/forums/showthr ... ?t=1074497
i've personally taken apart an 04 tranny and an 06 tranny and the transfer case gears do not swap between them... they are different
i've personally taken apart an 04 tranny and an 06 tranny and the transfer case gears do not swap between them... they are different
90' legacy built ej257 gt30r 6spd r180 and brembos Bitches 402whp @22psi :D -sexy red
94' Impreza wagon AWD 2.2ltr rally wagon FTW!
94' Impreza wagon AWD 2.2ltr rally wagon FTW!
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Subaru Technical Information Site Adobe files I.D.?
Dan--Sent you a PM that has more detail, but briefly, those charts are from a Subaru document. The second one, Adobe Reader MSA5T0510A, is from the '05 Service Manual. I can't see what the top one is because it is cropped off. Do you have the Adobe Reader file number from the top one?
I would like to just clarify/correct something.
There is a difference between final gear reduction and overall final dive ratio.
The overall final drive ratio is the same between the 06 & 07. The 1.1:1 stepper in the rear transfer gear combined with the 3.545 rear diff provides roughly a 3.9 final drive ratio.
Obviously you can't use an 06 transmission with an 07 rear diff, but in terms of overall final drive ratios between the 06 & 07, they're the same....and that may be 100% understood by the parties posting, I just fealt it wasn't very clear, especially to someone searching for information.
There is a difference between final gear reduction and overall final dive ratio.
The overall final drive ratio is the same between the 06 & 07. The 1.1:1 stepper in the rear transfer gear combined with the 3.545 rear diff provides roughly a 3.9 final drive ratio.
Obviously you can't use an 06 transmission with an 07 rear diff, but in terms of overall final drive ratios between the 06 & 07, they're the same....and that may be 100% understood by the parties posting, I just fealt it wasn't very clear, especially to someone searching for information.
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
very good point josh.....
let me see if i can clarify a little bit. all of the STi's final drives are 3.9 but the 06-08 use a 1.1:1 reduction in the transfer case which makes the final drive at the rear differential a 3.545
let me see if i can clarify a little bit. all of the STi's final drives are 3.9 but the 06-08 use a 1.1:1 reduction in the transfer case which makes the final drive at the rear differential a 3.545
90' legacy built ej257 gt30r 6spd r180 and brembos Bitches 402whp @22psi :D -sexy red
94' Impreza wagon AWD 2.2ltr rally wagon FTW!
94' Impreza wagon AWD 2.2ltr rally wagon FTW!
For me the issue is this, if after the transfer reduction, the final reduction is 3.90, then it is compatible with my 3.90 rear differential.
If the final reduction is 3.545 then it is not compatible with my 3.90 rear differential.
Are those two statements not correct?
Does the 06 use a 3.545 rear differential?
If the final reduction is 3.545 then it is not compatible with my 3.90 rear differential.
Are those two statements not correct?
Does the 06 use a 3.545 rear differential?
That's incorrect terminology. The final gear reduction at the rear differential is 3.545, NOT the final drive.jake15 wrote:very good point josh.....
let me see if i can clarify a little bit. all of the STi's final drives are 3.9 but the 06-08 use a 1.1:1 reduction in the transfer case which makes the final drive at the rear differential a 3.545
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
Those statements are correct.kleinkid wrote:For me the issue is this, if after the transfer reduction, the final reduction is 3.90, then it is compatible with my 3.90 rear differential.
If the final reduction is 3.545 then it is not compatible with my 3.90 rear differential.
Are those two statements not correct?
Does the 06 use a 3.545 rear differential?
From the info posted above, the 06 does not use a 3.545 rear differential.
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
Where I am having a mental problem understanding this is the lower chart above. The number of the Adobe reader file, MSA5T0510A, is taken from the '05 Service Manual. I got that info from the Subaru Technical Information Site. Dan says it is the '06 tranny. You can't see the number on the upper chart, but he says it is for the '07 tranny. What if it is actually the chart for the '06 tranny? That is the big question for me right now. I am going to the local Subaru dealer in a while and the lead mechanic is going to show me what their service manuals say.
Update--went to the dealer and got a sheet printed for the '06 STi tranny specs. The transfer gear ratio is 1.1 and the final is 3.545. I verified the data was for the '06.
On the charts above the upper one is for the '07 and the lower one is for the '05.
My fix now is to get a WRX R160 3.545 rear diff and the axles. Hope driving the car with the 3.90 rear diff did not break anything in the '06 tranny.
Update--went to the dealer and got a sheet printed for the '06 STi tranny specs. The transfer gear ratio is 1.1 and the final is 3.545. I verified the data was for the '06.
On the charts above the upper one is for the '07 and the lower one is for the '05.
My fix now is to get a WRX R160 3.545 rear diff and the axles. Hope driving the car with the 3.90 rear diff did not break anything in the '06 tranny.
My bad... i'll try better next timeLegacy777 wrote:That's incorrect terminology. The final gear reduction at the rear differential is 3.545, NOT the final drive.
i just called my friend in the parts department at the stealership and guess what? the 06 STi rear diffs are 3.545
i might have a WRX rear diff at the shop john.... but i dont have any rear axles. or i'm pretty sure you can just swap the ring an pinion... that way you wouldnt have to change your axles
told ya so
90' legacy built ej257 gt30r 6spd r180 and brembos Bitches 402whp @22psi :D -sexy red
94' Impreza wagon AWD 2.2ltr rally wagon FTW!
94' Impreza wagon AWD 2.2ltr rally wagon FTW!
There is a NASIOC guy in Mukilteo that has an '02 WRX rear end and axles for sale. How hard is it to swap ring and pinion gears? Do you need to press anything out/off? Jake, pm me your phone #, please.
Jake or Dan or Josh or anyone else--I would never doubt anything you say or post! Except, that there were diffrent opinions and even printed data on this. I had to make sure.
Jake or Dan or Josh or anyone else--I would never doubt anything you say or post! Except, that there were diffrent opinions and even printed data on this. I had to make sure.
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I've torn down a couple rear diffs. Its not that hard, and you don't need a press. The key is making sure your backlash is correct. The side covers with the races in it are labeled as to which side they should be on. As long as you don't take the shims off and get them mixed up, that part is no worry.
The pinion is the other critical area. The big nut on the end that also hold the companion flange in must be torqued properly. Otherwise it will make noises and prematurely wear out gears and bearings. My buddy who does that stuff all the time did it by feel, but there are torque specs out there, probably in Josh's collection manuals.
You can check the tooth engagement by putting chalk on the teeth and turning the diff through a whole rotation.
New seals are in your best interest when you do through it.
I'm not always right though, as we all found out in this thread
The pinion is the other critical area. The big nut on the end that also hold the companion flange in must be torqued properly. Otherwise it will make noises and prematurely wear out gears and bearings. My buddy who does that stuff all the time did it by feel, but there are torque specs out there, probably in Josh's collection manuals.
You can check the tooth engagement by putting chalk on the teeth and turning the diff through a whole rotation.
New seals are in your best interest when you do through it.
I'm not always right though, as we all found out in this thread
→Dan
piddster34 at h0tma1l d0t c0m
piddster34 at h0tma1l d0t c0m
John,kleinkid wrote:Update--went to the dealer and got a sheet printed for the '06 STi tranny specs. The transfer gear ratio is 1.1 and the final is 3.545. I verified the data was for the '06.
On the charts above the upper one is for the '07 and the lower one is for the '05.
My fix now is to get a WRX R160 3.545 rear diff and the axles. Hope driving the car with the 3.90 rear diff did not break anything in the '06 tranny.
If the transfer gear ratio is 1.1:1, and the rear diff is 3.545, then the final drive is 3.90, NOT 3.545.
If the final drive is 3.545, which I'm 99% positive it's not, the rear diff would be aprox 3.222.
I know I am making a big stink out of this, but this is a terminology issue that can be extremely confusing and misleading, as can be seen here. We may be saying the same thing....but it's how it's being said.
Also, did you notice any noise or other types of problems with the transmission? How long did you drive it?
Josh
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm
surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT
If you need to get a hold of me please email me rather then pm