How do you reset the computer on a Subaru 2005 Forester with automatic transmission

notify the dealer you bought it from

Do you have a non sealed transmission ? If yes, have you tried filling it with the vehicle running ?

The linkage or nuetral safety switch problem. Call a mobilemechanic thats xperiencd. If hes good takes money aftr job

you only do a computer reset when the check engine light is on

if you have an obd2 scanner at your disposal, you can reset the computer that way AKA clearing any stored trouble codes in the computer

are you saying you cant put trans in nuetral as have drained battery and need to push car so you are able get it jump started get a battery and take to car and jump that way

yes
automatic transmission will require you swap some sensors as the plugs are sometimes different.
manual transmissions are all the same until 2004

I'm not exactly sure what you're asking...however, if you want to put axles from a 2001 Legacy on to a 1999 forester, they'd both need to have the same motor (probably a 2.5L) and the same trans-axle/transmission. The forester MIGHT have a 2.2L motor which would cause me to think NOT. Of course if one car has an automatic and the other a manual transmission, then I would not recommend using one on the other. Hard to tell without being able to see them both. Sorry I couldn't be more definitive in my answer.

If it is a manual transmission, then it is a TY754 5 speed. If it is an automatic transmission, then it is a TZ1A2.

AUTOMATIC
Front differential: 1.3 quarts of 75w-90 gear oil
Transmission:(pan drain and refill only)
4 quarts of Dexron III ATF

MANUAL
(front diff and transmission are same fill point)
3.05 quarts of 75w-90 gear oil

You want to change from a standard transmission to an automatic transmission? You need a new transmission, clutch, gearshift, shift linkage just to start. You will be money ahead selling the car you have and buying one with an automatic.