2500HD and Z71 differences

[JaGsC5]

OK, here's the deal. I just sold my 2006 2500HD Silverado and Bought a 2008 GMC Sierra 2500HD Z71 duramax diesel. I loaded the bed with 500 pounds of weight plus 100 pounds of tongue weight and the nose was 2.5 inches higher than the rear.

First, I don't think there are any difference anymore between the GMC Sierra and Silverado but could be wrong?

The next question is what makes a 2500HD, a 2500HD and a Z71, a Z71? As stated above, my truck is a 2500HD Z71. I am trying to figure out exactly what I have with this truck.

I do think someone messed with the front torsion bar a little but is that enough to sag the rear? I guess I need to know what the difference is with a 2500HD and a Z71. Then I need to now what you get when the truck is both.



Thanks

 

[Z15]

This is all the Z71 off road suspension package is.....Nothing to do with springs or hauling capacity.

Z71 Suspension Package, Off-Road, includes 35mm deflective disk twin
tube shock absorbers, off-road jounce bumpers, 36 front stabilizer bar,
(NZZ) skid plate package and Z71 decals on rear quarters
1 - Requires (QIW) LT245/75R16E on-/off-road, blackwall tires or (QXT)
LT265/75R17/E all-terrain, blackwall tires. Not available with (ZW9) Pickup
box delete.
2 - Not available with (ZW9) pickup box delete.

If someone cranked up the front torsion bars to make the truck ride level then the rear is will sag when loaded as its normal for the truck to be lower in the front.