I was wondering if a grill like this with a lower bumper could be used for a intercooler or maybe a bigger radiatior. What do you guys think?

Id sure like to have that truck :D

http://auto-rv.com/adimages/jpg/CMWLIH2450275.jpgCategoryMedium And Heavy Duty TrucksYear2000MakeCHEVROLETModel3500Miles77000Pric e$16000
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2000 CHEVY 3500 HD DUMP. 77,000 mi., 3 yd. dump, 6.5L diesel, AC, new tires and tarp, very clean truck, exc. shape, no rust, delivery avail. $16,000 OBO. Hart, MI. 231-873-5059

IIRC the HD trucks have a 3" body lift. That is what makes the bumper appear lower.

IIRC the HD trucks have a 3" body lift. That is what makes the bumper appear lower.
They have a completely different chassis. It's similar but not the same.

The frame bigger. I have read it is taller on HD's.

It may have different body mount spacers too depending on location I don't know.