Does anyone know what the weight difference is in an LBZ Duramax 2 Wheel Drive versus a 4 Wheel Drive Single Cab Long Bed ? Is it fair to say that the 2 Wheel drive is about 300 to 400# lighter without the transfer case, drive shaft, front drive axles and the IFS unit or is it more ? What would have to be done to convert a 4 x 4 to 2 wheel drive and have the weight savings? I'm guessing remove the transfer case, drive shaft going forward, front drive axles, IFS unit, change out the tail shaft housing as well as change the length of the rear drive shaft. Does the output shaft have to be changed as well ?