does anybody know what i do about the wiring for the ecm when i change my 03 lb7 to 04 lly both 2500 hd. i think the ecm plug ins is different or can i use my lb7 ecm. would i have to change the wiring from the ecm to the fuse box underhood
i have a 2003 gmc 2500 and would like to put a 2004.5 lly in. i am woundering if i have to change the emc and will the wiring just plug in. i have the complete lly with the wiring harness . thanks