How do i tell the difference between Auto trans? My 99 forester has another trans in it.  I just bought a stock one. Just to see when I got home the trans in my car has been changed.

I have a TZ1b7Lcaaa-2D trans in my forester. And bought a stock trans TC1A37C2AA so do I need the computer and rear diff out of the car I got the trans out of sorry I'm new to these cars.

And I would like to know what car the trans is out of thats in my forester.

google the part numbers.

The one in yours now, the TZ1b7L...shows out of a '05 Legacy. I'd be surprised if that actually worked....and apparently it doesn't since you're asking.

Your main issue is that '99 was transition year for many Subarus. Phase 1 vs Phase 2 electronics, engines, and transmissions, so you'd need to find an exact match, I'd guess.

TC1A37C2AA (nor tZ1a37.....)= not a good number... nothing found in Google. TZ prefix usually means Auto; TY usually means Manual.

 

LOOK on the VIN ID tag by the Driver's strut tower under the hood. It shows your engine and transmission.