robvas

I have better pictures in the leveling kit thread if you want to dig through there, look for the time around last summer

The whole red area is the 'over extended zone'

Think of it this way. Put your truck up on a lift and let the front wheels come all the way down. Call that "fully extended". Anything past that is "over extended". As in the truck was never designed for the suspension to be pushed that far out/down. Now install your spacer kit (whether it's a strut tower kit, or control arm spacer kit, doesn't matter). You've just pushed the suspension down another inch or two. You are now past what was "fully extended" and you are now, by definition, "over extended" The blue drawing in the Bilstein picture is the exact opposite. Imagine you put your front suspension all the way up as far as it can go, under the front fenders of your truck. That's your full range on the compression side. Now stick that one or two inch spacer in there. You just lost some travel. I don't know if you call that "under-extended" or what.

Anything past factory is 'over extended'

It's only about 100lbs difference. I remember a crate LS1 weighing like ~450lbs. A 4.3 would weigh about 3/4 of what a V8 weighs.

You lose some suspension travel and will need the truck re-aligned. Also your suspension will always be a little bit 'over extended' compared to where it would normally be, so it may wear slightly faster. You know when you jack your truck up the wheels come down a little bit as the truck goes up? That's all your doing, is pushing the truck UP or pushing the control arms DOWN, depending on how you want to look at it.

Rear didn't look any higher on mine. I went with the RC 2" fron tleveling kit with the additional 1" in the rear

IMO that's too much gear for just 33" tires Is there an official list of what gears are available for the the rear end that comes with the 6.2? They had 3.23, 3.42, and 3.73 available in 2014 from the OEM. There's at least one guy out there with 4.10's isn't there? What aftermarket support is out there?

You could try driving around in M5

that's how it's supposed to work. If the front tires are sliding in sharp front turns like that, I wouldn't be surprised because of how big your tires are

Sounds perfectly normal to me.

Can you put up a video of it so we can see how bad it is?

Why don't you guys just install them on the highest setting, and if the rear is too low, just stick a bigger block in the rear? Rear blocks are cheap. And higher is always better am I right?