would a 2005 echo auto trans fit in a 2007 yaris

[supermoto]

nothin about improving the performance, I just have one echo 2005 auto trans on hand and would like to know before spliting both cars apart if it would work out? thanks

[CrankyOldMan]

Unlikely. The Echo uses the C150, the Yaris uses the C50. Key differences could include some or all of the following: mounting points, shaft splines in the differential, cable linkages, wire connectors. The engine block, starter and torque converter/flex plate should line up but that's about all that is likely to mate without serious modification.