Mitsubishi Galant Transmission Replace/Remove

What I Did Is Took This 2001 Mitz Trany Out Got Another One Everything Was The Same Except The Trany Didnt Have A Speed Senser In It. So I...

Replaced Entire Transmission, Hooked Everything Back Up, Reset Mongoose Alarm System With Supplied Code, Dash Lights Up No Unusual Lights...

Since I Had This Car The Transmission Didnt Work, Well Some Guys Changed It But Now They Are Telling Me That They Cant Find The Trasmission...