Sgt.Gator Posted August 15, 2014 Share Posted August 15, 2014 (edited) I found this on NASIOC. I like it because it includes the final drive ratio along with the years/cars they came in. If you know of any errors let me know and I'll edit it: Factory Gear Ratios for Reference All-Wheel-Drive 5-speed Transmissions USDM 3.454 / 1.947 / 1.366 / 0.972 / 0.738 / 3.900FD - '02-'05 USDM WRX; 3.545FD rear diff 3.454 / 1.947 / 1.366 / 0.972 / 0.738 / 3.700FD - '06-'07 USDM WRX 3.166 / 1.882 / 1.296 / 0.972 / 0.738 / 3.900FD - '08-current USDM WRX 3.454 / 1.947 / 1.366 / 0.972 / 0.738 / 4.444FD - '04-'08 Forester 2.5XT 3.454 / 2.062 / 1.448 / 1.088 / 0.780 / 4.111FD - '04-'13 Forester non-turbo 3.166 / 1.882 / 1.296 / 0.972 / 0.738 / 4.111FD - '05-'06 USDM Legacy 2.5GT 3.166 / 1.882 / 1.296 / 0.972 / 0.738 / 3.900FD - '07-'09 USDM Legacy 2.5GT 3.166 / 1.882 / 1.296 / 0.972 / 0.738 / 4.444FD - '05-'09 USDM Outback 2.5XT 3.545 / 2.111 / 1.448 / 1.088 / 0.780 / 4.111FD - '98-'01 USDM Impreza 2.5RS 3.545 / 2.111 / 1.448 / 1.088 / 0.780 / 3.900FD - '96-'01 USDM Impreza L/OBS 3.545 / 2.111 / 1.448 / 1.088 / 0.780 / 4.111FD - '96-'99 USDM Legacy 2.5GT 3.545 / 2.111 / 1.448 / 1.088 / 0.871 / 4.111FD - '96-'99 USDM Legacy Outback 3.454 / 2.062 / 1.448 / 1.088 / 0.871 / 4.111FD - '00-'07 USDM Outback 3.454 / 2.062 / 1.448 / 1.088 / 0.825 / 4.111FD - '08-current USDM Outback 3.454 / 2.062 / 1.448 / 1.088 / 0.780 / 4.111FD - '02-'04 USDM Impreza 2.5RS/'05 Impreza 2.5RS Sport 3.545 / 1.947 / 1.366 / 0.972 / 0.780 / 4.111FD - '93-'94 USDM Impreza 1.8L 3.545 / 2.111 / 1.448 / 1.088 / 0.825 / 3.900FD - '95 USDM Impreza 1.8L JDM 3.454 / 2.062 / 1.448 / 1.088 / 0.825 / 4.111FD – '93-'96 JDM Impreza WRX/STi 3.454 / 2.333 / 1.750 / 1.354 / 0.972 / 3.900FD – '93 JDM Impreza WRX RA 3.454 / 2.333 / 1.750 / 1.354 / 0.972 / 4.111FD – '94-'95 JDM Impreza WRX RA/STi RA 3.454 / 2.062 / 1.448 / 1.088 / 0.825 / 4.111FD – '93-'00 JDM Impreza WRX Wagon 3.083 / 2.062 / 1.545 / 1.151 / 0.825 / 4.444FD – '97-'00 JDM Impreza WRX RA/Type R/STi RA/22B STi 3.166 / 1.882 / 1.296 / 0.972 / 0.738 / 4.444FD – '97-'00 JDM Impreza WRX/STi 3.166 / 1.882 / 1.296 / 0.972 / 0.738 / 4.444FD – '01-'07 JDM Impreza WRX All-Wheel-Drive 6-speed Transmissions 3.636 / 2.375 / 1.761 / 1.346 / 1.062 / 0.842 / 3.900FD - JDM Impreza WRX Spec C/STi/STi Spec C RA/V-Limted/S202/S203/S204/Spec C RA-R - AUS Impreza WRX STi 3.636 / 2.235 / 1.521 / 1.137 / 0.971 / 0.756 / 3.900FD - USDM 2007-current Impreza WRX STi 3.636 / 2.375 / 1.761 / 1.346 / 0.971 / 0.756 / 3.900FD - USDM 2004-2006 Impreza WRX STi - UK/Europe/NZ Impreza WRX STi - JDM Legacy 3.0R Spec B 3.636 / 2.235 / 1.521 / 1.137 / 0.891 / 0.707 / 3.900FD - USDM 2007-2009 Legacy 2.5GT Spec B - JDM 2004-2007 Forester STi NOTE: USDM '04/'05 R180 2way clutch type LSD with 3.900FD. USDM '06-current R180 torsen LSD with 3.545FD. The NEW 6 speed MT (NOT the same 6spd tranny as the LGT SpecB/STI) 3.454/1.947/1.296/.972/.825/.695/ 4.444FD -2010 Outback Calculators for Speed and RPM, includes tire size and comparison graphing http://www.teammfactory.com/calculator Update 2-2019-I found this useful calculator at SubaruGears. Be sure to click on Calculate, then farther down Auto Shift. It's cool to watch the gauges, it feels more "real" than looking at a graph. http://www.subarugears.com/Ratios/Ratios.html I found this incredibly useful chart at Rallispec. Thanks Rallispec! "This file provides a means for referencing the original model(s) and gearbox/differential specifications based on the transmission code. It lists gear ratios, transfer gear ratio, final drive ratio, differential types, and some other data. The codes are divided into 4 sections: 6-speed transmissions with 85mm shaft centerline spacing (such as STI), 6-speed transmissions with 75mm centerline spacing (such as newer Legacy manual transmissions), 5-speed transmissions from turbo models (such as WRX), and 5-speed transmissions from normally aspirated models. Only all wheel drive transmissions from Impreza, Legacy, Baja, Forester, and Saab 9-2X models are listed at this time." http://www.rallispec.com/downloads/Transmission%20ID%20Chart_Public.pdf When you are comparing the tranny to the above Rallispec pdf, use this tag on the tranny: Example 5 speed USDM LGT: Example 6 speed JDM Forester STi: Edited February 11, 2019 by Sgt.Gator Updated with 01-07 JDM WRX Nothing like a race track to find the weak points in man and machine. "Good Judgement comes from Experience. Experience comes from Bad Judgement" Link to comment Share on other sites More sharing options...
whitetiger Posted April 17, 2015 Share Posted April 17, 2015 Its about time. Link to comment Share on other sites More sharing options...
Zack Spec B Posted September 20, 2016 Share Posted September 20, 2016 Since i dont know how to subscribe. Gotta read this later tonight Link to comment Share on other sites More sharing options...
GEE-OTTO Posted December 1, 2016 Share Posted December 1, 2016 Here is the rallispec chart also helpful for cross referencing gearboxes: http://www.rallispec.com/downloads/Transmission%20ID%20Chart_Public.pdf Link to comment Share on other sites More sharing options...
whitetiger Posted December 1, 2016 Share Posted December 1, 2016 ^awesome chart. Link to comment Share on other sites More sharing options...
Cincy05LGT Posted November 17, 2017 Share Posted November 17, 2017 Anybody find info on the JDM legacy gear ratios? Sent from my Pixel 2 using Tapatalk Link to comment Share on other sites More sharing options...
Mr.RMFC Posted October 16, 2018 Share Posted October 16, 2018 So in terms of bolting to the engine. Will a transmission from a 2011 wrx bolt up to my 2005 legacy gt? Will the mounts all match? I have the rear dif to go with it so the ratios will all be the same. Is the speedometer based off of wheel speed or is it a sensor somewhere else? Will I see a change in mpg on the highway with the wrx trans? Swapping due to needing a new trans Link to comment Share on other sites More sharing options...
whitetiger Posted October 16, 2018 Share Posted October 16, 2018 it will bolt up. make sure you use the 2011 wrx clutch and associated hardware. speedo is from the wheel speed sensors. MPG difference will be negligible. go for it. Link to comment Share on other sites More sharing options...
Kaden Posted December 28, 2020 Share Posted December 28, 2020 Anyone know what year sti 6 speed trans will fit on my 1998 legacy gt Sedan 2.5L DOHC it’s turbo’d Link to comment Share on other sites More sharing options...
cooki3monst3r77 Posted March 28, 2021 Share Posted March 28, 2021 Does anyone know how to determine the front or rear gearbox gear ratio? Link to comment Share on other sites More sharing options...
awfulwaffle Posted March 28, 2021 Share Posted March 28, 2021 Find the model number sticker on the side of the trans, then find it in this chart (also in Sgt. Gator's original post above). That, or just find what came with your year/model if the trans is original and find it in the chart. https://www.rallispec.com/downloads/Transmission%20ID%20Chart_Public.pdf Or, open er' up and count teeth. Link to comment Share on other sites More sharing options...
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