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Okay, I'm intrigued, and on the hook. The only splash shield metal replacements I ever found were offered by lift companies with propitiatory replacements that only fit their designed suspension lifts. The inter-cooler area is a major concern if you run in heavy brush areas, and poking a stick in that unprotected area, will cause some serious grief. I have seen a few homemade transmission shields which addressed the external fluid filter, but no real attachment points used for mounting to the frame. AKA, incomplete modification build logs. I once saw a company in Canada, that offered complete undercarriage upgrades in GM vehicles that were fleet or oil field industry aligned, but lost their info in a computer crash years ago. They had skid plate upgrades that rivaled RAM power wagon protection.
If you have some picture's of your work, it would be appreciated by many here who have lamented exactly the lack of love GM has shown, when compared to some of their rivals. During my trucks era, a Z-71 on a HD was not available,.....now they are. During that era, a Z-71 basically had 3 things that were upgraded. They were the 'Jounce Bumper's' (torsion stops), the shocks, and a rear locker. When I had my new 1997 Z-71, these were what was offered as a standard upgrade. In 1999, my new Z-71 (trade up) had the jounce bumpers (poly vs a hard foam bump stop, and the locker. The shocks were no longer Bilstien's (YELLOW), but a lower grade unit (BLUE) offered as standard equipment with that trim level.
On my truck, I did the bump-stop and Bilstien 4800 shock upgrade(Z-71 SPEC). The shocks were a big improvement on hwy driving, and the jounce bumpers helped with slow speed compression of the suspension by not allowing full bottoming out (Duramax engine wt.) , when the foam bumper stops fully compressed. I have been happy with the G-80, and only wished there was a front L/S, or better yet a locker that didn't put such a big question mark on the designed front drive-train durability if installed.