mke LGT Posted August 16, 2016 Share Posted August 16, 2016 So I blew my tranny in my 2010 LGT. Looking for options for replacements that will be as strong or stronger than the 6MT that came in the GT's. I've seen mention of the 2.5i 6MT being the same with just a shorter 5th and 6th gear, but nothing that seemed very convincing, proof, or first-hand experience/confirmation. These are much more affordable and easier to come buy with low miles. Also, does anyone know if the transmission for the diesel EE20 the same as the 6MT on the GT's (http://www.boxeer.com/ee20_parts)? Link to comment Share on other sites More sharing options...
Deadrick20 Posted August 16, 2016 Share Posted August 16, 2016 http://forums.nasioc.com/forums/showthread.php?t=2748989 Do we know if the transmission mounts on the 2015 WRX are the same as the 5th gen Legacys? Link to comment Share on other sites More sharing options...
Deadrick20 Posted August 16, 2016 Share Posted August 16, 2016 What are your driving habits and current power output of your car? Link to comment Share on other sites More sharing options...
mke LGT Posted August 16, 2016 Author Share Posted August 16, 2016 I'm a spirited daily driver. Don't beat hard on it but don't baby it either. Take it to the drag strip once or twice per year. I just got e-tuned on E85 and should be around 325hp/375ft-lbs. Link to comment Share on other sites More sharing options...
BBPeik Posted August 16, 2016 Share Posted August 16, 2016 Search is your friend. Here is one and maybe the best option other than a STI swap, which is possible but crazy hard work. http://legacygt.com/forums/showthread.php/transmission-went-boom-238027.html?highlight=transmission+boom My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
dgoodhue Posted August 16, 2016 Share Posted August 16, 2016 So I blew my tranny in my 2010 LGT. Looking for options for replacements that will be as strong or stronger than the 6MT that came in the GT's. I've seen mention of the 2.5i 6MT being the same with just a shorter 5th and 6th gear, but nothing that seemed very convincing, proof, or first-hand experience/confirmation. The ratio for 5th and 6th gears are different per the factory service manual. The 2.5i 6MT transmission obviously isn't stronger, but if you look at the list price for the 6MT assembly, it is the same list price down the penny (currently $6409.86). I am guessing their aren't very many difference between them. Link to comment Share on other sites More sharing options...
FLlegacy Posted August 16, 2016 Share Posted August 16, 2016 http://forums.nasioc.com/forums/showthread.php?t=2748989 Do we know if the transmission mounts on the 2015 WRX are the same as the 5th gen Legacys? No they are not the same, they are just like all other subarus except the 5th gen. The 2015+ wrx transimission is probably an evolution or an exact copy of ours without the tapped mounts for the 5th gen mounts. Right now the only viable drop in solution is a replacement. Unless you get to work on a conversion kit for the STI 6spd... Link to comment Share on other sites More sharing options...
cww516 Posted August 16, 2016 Share Posted August 16, 2016 Have any aftermarket gearsets popped up for the WRX box yet? That's probably a viable option as well. Link to comment Share on other sites More sharing options...
FLlegacy Posted August 16, 2016 Share Posted August 16, 2016 Have any aftermarket gearsets popped up for the WRX box yet? That's probably a viable option as well. I believe not specifically, but there may be a chance the old 5 speed set will fit, the problem, as Acumenhokie (sp) found, was the case distortion hence the blast plates. So a stronger gear set alone will just break something else like the a big stress crack in the side of transmission from flexing. I think the fix will be some type of bell housing mount for the sti 6speed to bolt into the 5th gen. Link to comment Share on other sites More sharing options...
GTEASER Posted August 16, 2016 Share Posted August 16, 2016 I think the fix will be some type of bell housing mount for the sti 6speed to bolt into the 5th gen. And then you also have to figure out the axle spline different between the STi axles and our axles on the front diff. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
fahr_side Posted August 16, 2016 Share Posted August 16, 2016 And then you also have to figure out the axle spline different between the STi axles and our axles on the front diff. The BM 6MT axles aren't the same as the BL 5MT ones? The WRX 5MT front axles plugged n played with my STi 6MT trans... I have heard of one shop that put a TY856 into a BR9. Of course some welding and machining work had to be done on the bellhousing to create pads to place the 'engine' mounts that install there. A plate also had to be made to mate a GRB shifter mech to the body as the aperture for the cable-shifter mech is not common to other Subarus, at least not late-model ones. Aside from that it was pretty straight forward as I know it. 5EAT drive shaft worked, the front axles fitted etc. The car was converted from 5EAT and the shop involved never could figure out how to get over the CANbus issues and out of limp mode. Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
FLlegacy Posted August 16, 2016 Share Posted August 16, 2016 And then you also have to figure out the axle spline different between the STi axles and our axles on the front diff. Swapping the drive cups from an sti set would probably do it, at either the inner or outer cv joint. Or full sti swap...win win win! At any rate the cv axles is small potatoes compared to the transmission mounts. Link to comment Share on other sites More sharing options...
BBPeik Posted August 16, 2016 Share Posted August 16, 2016 ^^^Yep and the mounts are small potatoes compared to the canbus issues. I am not saying I won't attempt it someday, but it wont be easy. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
jojorios Posted August 16, 2016 Share Posted August 16, 2016 I've never had a tranny fail on me so I don't know how it works but, if it fails. Can't it just be rebuilt instead of getting a new one? I thought that the gears were the same from the WRX 15'? Or is that not how it works? Link to comment Share on other sites More sharing options...
FLlegacy Posted August 16, 2016 Share Posted August 16, 2016 ^^^Yep and the mounts are small potatoes compared to the canbus issues. I am not saying I won't attempt it someday, but it wont be easy. What would be the CANBUS issue with our cars and an STI tranny? I am sure the newer variant has gear dependent boost just like we have and a display with gear selection in it. So getting two subaru systems to talk hasn't been an insurmountable issue. Fahr Side's example was going form an auto to 6mt. I think we will have an easier trail to blaze...maybe... Link to comment Share on other sites More sharing options...
wrxwhit Posted August 16, 2016 Share Posted August 16, 2016 This is such a depressing thread, make it stop. I've exploded two trannys on the old bugeye and it certainly can wreak havoc on the wallet! Link to comment Share on other sites More sharing options...
FLlegacy Posted August 16, 2016 Share Posted August 16, 2016 I've never had a tranny fail on me so I don't know how it works but, if it fails. Can't it just be rebuilt instead of getting a new one? I thought that the gears were the same from the WRX 15'? Or is that not how it works? Yes you can have it rebuilt or replace it with a rebuilt one. Which leaves you with the knowledge that the transmission will fail again at some point. Which doesn't make sense financially. Link to comment Share on other sites More sharing options...
cww516 Posted August 16, 2016 Share Posted August 16, 2016 That gear position indicator in the gauge cluster calculated the gear you're in based on wheel speed and engine speed, so if the ratios are much different, that may not be happy. Not sure if that has any bearing on anything else, though. Link to comment Share on other sites More sharing options...
jojorios Posted August 16, 2016 Share Posted August 16, 2016 So any rebuilt transmission is destined to take a poop at some point? Link to comment Share on other sites More sharing options...
Zee199969 Posted August 16, 2016 Share Posted August 16, 2016 So any rebuilt transmission is destined to take a poop at some point? I believe acumenhokie's rebuilt tranny has been solid for him My "Build" Link to comment Share on other sites More sharing options...
FLlegacy Posted August 16, 2016 Share Posted August 16, 2016 That gear position indicator in the gauge cluster calculated the gear you're in based on wheel speed and engine speed, so if the ratios are much different, that may not be happy. Not sure if that has any bearing on anything else, though. Anywhere there are calculations there are tables, and they can be adjusted so IMO this isn't some massive hurdle. Some of our tuners here probably even know how to get at these tables. Link to comment Share on other sites More sharing options...
BBPeik Posted August 16, 2016 Share Posted August 16, 2016 What would be the CANBUS issue with our cars and an STI tranny? I am sure the newer variant has gear dependent boost just like we have and a display with gear selection in it. So getting two subaru systems to talk hasn't been an insurmountable issue. Fahr Side's example was going form an auto to 6mt. I think we will have an easier trail to blaze...maybe... Besides just getting them to talk I think the biggest hurdle would be the SI drive. That is a whole can of worms in itself. Easier than a auto to manual swap, but still tricky. I am sure one of us will eventually do it. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
dgoodhue Posted August 16, 2016 Share Posted August 16, 2016 Besides just getting them to talk I think the biggest hurdle would be the SI drive. That is a whole can of worms in itself. Easier than a auto to manual swap, but still tricky. I am sure one of us will eventually do it. How do the other STi transmission swaps control the DCCD? Is the DCCD control normally integrated into the STi ECM? Anywhere there are calculations there are tables, and they can be adjusted so IMO this isn't some massive hurdle. Some of our tuners here probably even know how to get at these tables. This assume the person who disassembled (reverse engineered) the code in the ECM has identified or bother defining them. I got the impression from reading on ROMraider that our ECM were not 100% defined. Link to comment Share on other sites More sharing options...
FLlegacy Posted August 16, 2016 Share Posted August 16, 2016 How do the other STi transmission swaps control the DCCD? Is the DCCD control normally integrated into the STi ECM? This assume the person who disassembled (reverse engineered) the code in the ECM has identified or bother defining them. I got the impression from reading on ROMraider that our ECM were not 100% defined. Up to this point there has been no need to define the tables. Where there is a will... We don't need SI drive though, and that is more dependent on the engine than transmission in our cars. The dccd can use an aftermarket stand alone controller also. Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
dgoodhue Posted August 16, 2016 Share Posted August 16, 2016 Up to this point there has been no need to define the tables. Where there is a will... When there is a production total of only ~1700 units, their needs to be a motivated person with the knowledge or resources to accomplish it. Link to comment Share on other sites More sharing options...
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