THE Transmission Thread 2.0, Now with Pictures

[Ironhydroxide]

If you haven't had some previous experience with transmissions before. Go to THE TRANSMISSION THREAD FOR DUMMIES first, and then return after reading up a bit.

I've been seeing a lot of Misinformation and hearsay about Subaru transmissions going around. I've decided to do this writeup to clear this up, and keep it in an easy to read/understand format for all, newbs and OG's. that said, i am human, i do not know everything there is to know about Subaru transmissions, so if theres something i've missed, please let me know. if something is wrong, also let me know.

and lastly, this is INFORMATION, not a debate on if/what gearsets are strong enough to hold the power. All i'm going to say on the subject of power and gearsets is, I ran an EJ18 1994 Transmission (thinnest gears available) on my 2000 RS with an EJ20G (about 320 BHP with the mods I had), and I autox'ed it as well as Drag raced it with NO issues.

What you need to know about Subaru Transmissions

• Every Subaru Transmission has a Transmission code, this code tells what gears the transmission had stock, and what it came in stock.
• There are 3 Different Styles of transmission
  
  • Phase 1 5 Speed
  • Phase 2 5 Speed (CANBUS info Here)
  • STI 6 Speed (also Legacy SpecB)
• STI 6 Speed (and Legacy SpecB) will not work for the 818 currently. (dont ask here, there's other topics about this, like this one )
• There are 3 different Clutch/flywheel setups for 5 Speed Transmissions
  
  • Push Style clutch
  • Pull style WRX clutch
  • Pull style STI clutch
• If you use a Phase 1 transmission, get a Phase 2 center diff housing.
• Final Drive can be changed in Subaru transmissions (though options are limited)
• A Limited Slip can be added to the Front (our rear) differential
• Specific gearing in the gearsets can be changed, though is much more indepth than just changing final drive.