Buy a Haynes manual or get a subscription to Mitchell On Demand via internet. All the V-8 MAFs are the same per year so the V-6 might work too. I'd have to look it up Monday if no one knows. You have an 8.6" 10-bolt. Post the G codes off the SPID label in the glove box and someone can tell you what ratio you have. With a 6 and 5-speed I'll guess 3.73's. Most auto 4.3s had 3.73's and 4.10's back then. An 06 truck engine does not need the wheel swapped...it's the GTO LS2 that does. I'm not sure how an LT4 GEN II clutch will work on a GEN III engine.