2003 Chevy Monte Carlo Transmission Interchange??

Excuse me if this been asked but I am a newbie and in need of help....

Hello I have a 2003 Chevy [COLOR=blue !important][FONT=inherit !important][COLOR=blue !important][FONT=inherit !important]Monte [/FONT][COLOR=blue !important][FONT=inherit !important]Carlo[/FONT][/COLOR][/FONT][/COLOR][/COLOR] SS 3.8L that I bought knowing that the transmission was shot. So my first mistake was that I got a transmission from a junkyard from a 2000 pontiac grand prix on the advice of a friend.

The tranny I got out of the 2000 Pontiac Grand Prix has 14 wires from harness plug that goes to the transmission while the Monte Carlo harness plug that goes to the transmission has 16 wires.

I asked a few people and I was told that it is not the right transmission. That too many changes have been made between 2000 and 2003. So therefor some of the gears will not shift if I install it.

My question is will the transmission I have from the 2000 Pontiac Grand Prix work in my 2003 Chevy Monte Carlo?

Also if not, then in what year Chevy Monte Carlo can I use for my 2003? Can I do 2001? 2002? 2004? 2005?

Lastly What other cars (Make-Model-Year) is interchangeable with a 2005 Chevy Monte Carlo?

Thank you so much in advance.

no transmission prior to 2003 will work. 03 and up grand prix, monte carlo, bonneville, regal etc should work. The only difference externally is the webbing on the back of the case, which doesn't bolt to anything. At least it doesn't in my application.

Car-Part.com--Used Auto Parts Market is great for finding what interchanges and local yards.

Thank you very much "JEVIK" for your input I really appreciate it.