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That is a vent tube, It let's the pressure out of the differential so it don't blow the grease seals out.
The front track of the 2003 Chevrolet Silverado-1500 is 5 ft. 5 in. (65 in.).
The front track of the 2003 Chevrolet Silverado-2500HD is 5 ft. 8.6 in. (68.6 in.).
No everything about it is different.
The 2003 Chevrolet Silverado-2500HD is 6 ft. 7.7 in. (79.7 in.)12V front power outlet(s) wide.
The 2003 Chevrolet Silverado-1500 is 6 ft. 6.5 in. (78.5 in.)12V front power outlet(s) wide.
The 2003 Chevrolet Silverado-1500 has rear wheel drive.
The 2003 Chevrolet Silverado-2500HD has rear wheel drive.
The evaporator in the '03 Silverado is under the dash on the passenger side. Unfortunately to replace it, you have to remove the front dash. This is probably one where you will need to take it into the shop.
No it`s sealed unit
No, a 2003 Matrix is front wheel drive with power getting to the wheels via CV joints.
You can find an exploded schematic view drawing of a 2003 Dodge truck front end online at places like Ram ForumZ and Diesel Place. You can also find this expanded version of the schematic on Diesel Truck Resource online.