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I went to the auto parts n the said I need to make sure I have the m15 tranny ... I have the 4sp automatic 4t45 but I don't know what the m15 is ... Help plz
 

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Moderator Member Thingy
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I found a link to the M15 reference to torque converter size for the 4T60 transmission but that isn't used on any Pontiac G6.
http://en.wikipedia.org/wiki/GM_4T60-E_transmission

There is also this link which shows the LZ9 engine (your engine) with a reference to 4 speed and the M15 reference but the bottom wrongly labels it as 2008-2010.
http://parts.nalleygmc.com/showAssembly.aspx?ukey_assembly=406168

There is this also:
http://www.gmpartseast.com/pontiac/engine/2006-g6-lz9.html

See if that helps, there might be a difference based on tapshift?
 
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