Could someone please tell me which # in the vin indicates this and which is which. Thanks.

not sure if this is what you are talking about but 8th digit indicates what motor it has. a 1 is LB7, 2 is LLY , D is a LBZ. i don't know what a LMM or LML are

Its a 6 so i think it is a LMM. Thanks

Yes the 6 is LMM. Check this post on that. http://www.dieselplace.com/forum/showthread.php?t=400271&highlight=lmm+vin+number

Brian

10th # of the VIN is the year built.

Here is pretty good site on reading the GM VIN number. A bit out dated but explains alot.
http://en.wikibooks.org/wiki/Vehicle_Identification_Numbers_%28VIN_codes%29/GM/VIN_Codes

Brian