The 1000D is for 2004.5 to 2007 trucks with the 600 series engines. The 1000C is for 2003 to 2004 trucks with the 555 series.
1000C
Level 1: 40 Horsepower - 150 Foot Pounds of Torque
Level 2: 50 Horsepower - 180 Foot Pounds of Torque
Level 3: 60 Horsepower - 200 Foot Pounds of Torque
Level 4: 70 Horsepower - 220 Foot Pounds of Torque
1000D
Level 1: 25 Horsepower - 50 Foot Pounds of Torque
Level 2: 45 Horsepower - 75 Foot Pounds of Torque
Level 3: 65 Horsepower - 150 Foot Pounds of Torque
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2008 Ram 3500 CTD 6.7/68RE/3:73 LSD (It was built right, nothing fell off)
Previous Rams: 1990 CC Dually, 1994 RC LB, 1995 CC SB, 1998 QC Dually,
2000 QC Dually, 2001 QC Off Road, 2003 QC Dually, 2005 QC Dually
REAL TRUCKS DON'T HAVE SPARK PLUGS