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One of the front axle shafts may have a disconnect in it. My Suburban has one. This does not prevent the spider gears from spinning, but it does prevent the front drive shaft from spinning. Coast down will be greatly affected because it's an aerodynamic pig (improved a bit by you).
The screwed up way GM does some computer diagnostics is the problem with the block heaters. If it detects a "cold start situation", which on some models involves the ignition being off for more than 10 hours, it will set off a CEL code. It is harmless. To prevent these CEL from coming on, they put a thermostat in the heater cord, that prevents operation above 0°F. Every other manufacture figured it out, just not GM. This started in 2004 or 2005. You may be able to use one all year long, just check. That said Katz supposedly makes two for my vehicle, one with the thermostat & one without. I haven't investigated further.
Has anyone ever put the stick on pad heaters onto transmissions & differentials (that don't live above the 48th parallel)?
Good luck.
Don
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