OhMyNuggets Posted April 22, 2022 Share Posted April 22, 2022 (edited) Hey guys so I have a 1999 forester L that I daily and have the normal 200k tranny problems. I want to put a 6 speed in if at all possible. I've been told be some that a pre 99 to 99 legacy 6mt will bot to it without needing to replace anything besides a speed sensor with possible driveshaft length issues. Any thoughts on the matter that could be helpful? Edited April 22, 2022 by OhMyNuggets Link to comment Share on other sites More sharing options...
el_freddo Posted April 22, 2022 Share Posted April 22, 2022 There are two different types of six speed - one that’s a different design to the 5spd and is considered the “proper” six speed because of its strength. The other is a split case 5spd with a sixth gear built onto the back of it. If you’re after performance the proper six speed is the way to go. The best is from the STi from what I understand. As for what you need depending on what box you have, I’ll leave that up to those that are in the know. Cheers Bennie 1 Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted April 22, 2022 Share Posted April 22, 2022 (edited) final drive ratio of rear diff must match the trans FD ratio. Edited April 22, 2022 by 1 Lucky Texan 1 Link to comment Share on other sites More sharing options...
wtdash Posted April 22, 2022 Share Posted April 22, 2022 The Legacy 6MT must be either a JDM or DownUnder (El Freddo?) option...I've not seen one in the US market. I'd make sure I have a reliable source for it and the DIY install. The '04+ STI 6MT is a much bigger and $$ swap. Otherwise, any 5-speed from a '97-'00 (maybe a couple years newer too) Subaru that was connected to the EJ25x should bolt up, and have the 4.11 to match your rear diff. 2 Link to comment Share on other sites More sharing options...
OhMyNuggets Posted April 25, 2022 Author Share Posted April 25, 2022 On 4/22/2022 at 4:05 AM, el_freddo said: There are two different types of six speed - one that’s a different design to the 5spd and is considered the “proper” six speed because of its strength. The other is a split case 5spd with a sixth gear built onto the back of it. If you’re after performance the proper six speed is the way to go. The best is from the STi from what I understand. As for what you need depending on what box you have, I’ll leave that up to those that are in the know. Cheers Bennie Thanks for the advice. It's really just for highway. I like the gearing already so I don't want it to change since I take it off road alot. I just need a final drive so I'm not at 3500rpms at 70. Link to comment Share on other sites More sharing options...
wtdash Posted April 26, 2022 Share Posted April 26, 2022 The '97-'99 Legacy OB 5-speed will spin more RPMs in 5th. The '96-'99 Legacy GT is an option, but you'd want to double-check its ratios (its FDR is still 4.11) as I don't recall. From what I read recently the '99+ (phase 2) 5-speeds are better??? But I have 260K on my '98 Forester (and some of that has been turbocharged). Link to comment Share on other sites More sharing options...
el_freddo Posted April 26, 2022 Share Posted April 26, 2022 The phase 2 are “better” because the cases are stronger and the gears a couple of mm wider on 1st and 2nd. I can’t remember if they widened 3rd to 5th too. Cheers Bennie Link to comment Share on other sites More sharing options...
OhMyNuggets Posted May 3, 2022 Author Share Posted May 3, 2022 Thanks guys my ratio is 4.11 too so the legacy gt 5 will work. Link to comment Share on other sites More sharing options...
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