Will a 1997 dodge 1500 transmission 4 wheel drive fit 2001 2500?

No, a 1997 Dodge 1500 4WD transmission will almost certainly not fit a 2001 Dodge 2500 4WD. While they might seem similar, there are significant differences between the 1500 and 2500 series, especially across model years. The 2500 is a heavier-duty truck designed for significantly more towing and hauling capacity, resulting in a stronger, larger transmission. Bolt patterns, bellhousing dimensions, input shaft diameter, and even the overall case size are likely to be incompatible. Even if some components *looked* similar, attempting to force a fit would likely result in damage to the transmission, transfer case, or other drivetrain components.