Originally Posted by
Brads_rs
I have a customer who purchased an 07 GMPP LS2 crate motor without harness/ecm and is putting a 4L65E tranny behind it. He wants me to build the harness and program the ecm and tcm. My question is which ECM should i use E67 or E38? And what tune should i start with. I have been going through all the tunes on holdencrazy and cant come up with a combo that will work, even thought of changing segments around to get a base to start with but i'm finding that getting the right OS to switch between segs is kinda hard. any help would be great. Thanks