Wake
Full Access Member
Converting an LT to an LTZ isn't a matter of swapping out some moldings and slapping slapping some 20s on. The whole suspension system has to be changed, interior features probably have to be added and reprogrammed. Whatever more it costs to go from an LT to an LTZ on a dealer lot, you can almost double it if all the work has to be done post facto off of the factory line.
I'm not so sure it works that way today.
My friend had a Cruise LT that was loaded better than the LTZ on the lot.
I also had an 02 Trailblazer LTZ that really wasn't any different than you could load an LT (LT level 3 level I think). You could get an LT and order the other options that would equip it as an LTZ without the LTZ badge. For instance, the leather interior, moonroof, and Bose sound system that would be part of the standard LTZ package would be extra cost orderable items on an LT package. In the end, an LT could be equipped just as well as an LTZ.
The suspension in the trucks should be the same unless you rebadge the model, 1500 vs 2500 vs 3500, or Chevy vs GMC (I think that was limited to older models though).
If the truck really is an LTZ, it should have LTZ listed on the RPO code sticker in your truck. I don't remember how GM noted the different LT levels/uplevels, but I think it was LT1, LT2. LT3.
$5K is a lot to expect in trade-in difference between an LT and LTZ, it's usually only a couple/few hundered difference in trade depending on age and mileage. When I bought my 02 LTZ the dealer also had an 04 LT which they were asking more than my 02 for and my 02 had less mileage and better equipment. The dealer should be going by factory options, not strictlly by LT or LTZ.
In this economy, trading in a vehicle sucks, but at the same time we can usually work a pretty good deal on a used vehicle purchase at the same time.