Need some transmission swap info in order to save my Leggy!!

[soobrdad02]

Hey everyone, I just wanted to find out if I could use a '99 4EAT n/a transmission to replace the currently non-working one in my '91 4EAT n/a transmission. I need to know if it'll be a direct bolt-up, or if I'll need additional parts to make it work. I don't know the gear ratio on the '99 yet and wanted to know if this would be a plausible swap. Any help would be GREATLY appreciated, THANKS!!!

[Legacy777]

Unfortunately the 99 4EAT will not work with your 91 car. Around 97 or so Subaru changed the 4EAT. There is a phase 1 and phase 2 transmission. They have different internals and different electronics/sensors. The electrical plugs are different and will not mate together.

Check out this post for some more info.

http://bbs.legacycentral.org/viewtopic. ... 75#p362275

[soobrdad02]

Darn! So even if the FDR matched up, the electronics would kill me? Grrrrr... Any ideas as far as years that I could go with(aside, of course, from 90-94)? Again, thanks in advance everyone!

[Legacy777]

I think it was around 97 when they changed to the phase 2 4EAT. So I'd look for transmissions before that.....keeping in mind you still need the FD ratio to match.