Lowering a 3rd Gen Dodge 4WD 2500/3500 Truck

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LWB Quad Cab
SWB Quad Cab
Reg Cab
Location
Distance
Drop
Distance
Drop
Distance
Drop
Front Bumper
-39.40
-0.31
-39.40
-0.35
-39.40
-0.35
Front Axle
0.00
0.00
0.00
0.00
0.00
0.00
Front of Box
123.60
0.96
103.60
0.92
103.60
0.92
Rear Axle
160.50
1.25
140.50
1.25
140.50
1.25
Rear of Box
202.70
1.58
180.80
1.61
182.70
1.63
Rear of Tailgate
224.70
1.75
202.80
1.80
204.70
1.82
Angle change in degrees
0.45
0.51
0.51

This slide shows the relative drop of the truck at various locations along the frame after removal of the spacers.  Distance dimensions are shown in inches.  The drops shown above are based solely on the geometry of the chassis as shown on the top line.  The actual height at each location is dependent on the model (2500, 3500), tire size, and 2WD or 4WD. 

To determine the actual height of a specific truck, you can either measure the height of your truck at each location and calculate the new height from the data in the chart above, or you can get the specs. for a specific vehicle configuration from The 2004 Body Builder's Guide.  After selecting the "Cab", click on "Views and Charts".  Continue to select the configuration you are interested in, and then click "Plan and & Side View" and "Charts" for specific dimensions for the configuration.

There are two discussion threads on the TDR forum on this subject.

'ld like it shorter...
Spacers removal for lowering rear end
Slide 8