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!!!

bellhousing bolt pattern will be different - but it will still work.

 

if it's a Forester, SUS, GT, LSi, or OBW - the final drive gear will be 4.44 and not match your legacy. you'll have to swap rear differentials as well. things like brightons, sedans should be 4.11. your 91 legacy should be a 4.11 or 3.9, someone will fill us in.

 

the 99 will have an external filter where yours does not. doesn't matter, just letting you know that difference which you'll see.

 

there were electronics/speed sensor changes at some point and 99's are generally known to be more upwards compatible (in other words with 2000 and 2001), but i don't know if that matters or not, hopefully someone else will chime in about that.