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14-18 sierra/silverado and the 15-20 tahoe/yukon for sure have vacuum pumps to increase vacuum for when it is in 4 cylinder mode. the 07-14 doesn't have them. I'm just use to working on the newer one's so vacuum pump info is of no use here.
$50 to just disable AFM here-> https://www.lt1swap.com/afm_delete.htm
For me when the 5.3l kicks the bucket I'm swapping in a l8t it doesn't have AFM on it.
How are you going to control that 6.6?
You can get the l83 ecm tuned for the L8T. Several people have done it already.
Void the warranty????
Warranty is long gone on any GMT900 by now.
Isn't the L83 for 2015+, which is a different engine.
Yes you're right. I'm going to be doing the swap on my sierra which is 14-18 not 15-20 like the tahoe and yukons
