I'm in the process of swinging a motor into my daughters 08 legacy. she paid a little extra for the low miles trans that is bolted to her new low miles motor from an 09 impreza. the trans id numbers are very similar except for one digit.

08 legacy trans - TZ1B8LC4BA

09 impreza trans-TZ1B8LCEBA

what is the difference? there are also some electrical differences. the 08 trans has a sensor on the tail shaft and a screw in filter. the 09 does not. it does have bosses for them though. it looks like it plugs right in but I dont know if it will work.

the shift selector switch is different as well. but has what looks like the same pigtail.

is the 08 tailshaft sensor

is the 08 select switch

is the 09 switch

is the 09 tailshaft housing with boss, without sensor.

 

I guess what im asking is, can i use the 09 trans? and what do i need to change to use it?

My main concern would be if the final drive ratios are the same.

I did a ton of research on that first. and as far as I can tell, they are the same. then I saw some info on whats called "dynamic drive" or something colorful like that. it seems that might be the difference in the two transmissions.