Thanks much!

I still can't believe that the commanded AFR is a full 3 to 4 points RICHER in the lower temperature cells of the OL VS Temp Vs Vac table in the BJDR bin vs the BJYM... I mean, the only difference (on the surface anyways) is one bin is setup for a 4L60 and the other a 4L80.... Both are 350 TBIs etc etc. Like you said though, GM probably fudged it to get the deisred effect elsewhere. Here I though using the BJDR as a starting bin would be best since it was a 350 and 4L80 tune, which is what I have put in this truck... I guess that's what I get for blindly assuming everything else would also be "close enough"......