My Chev express van takes p245/75r16 tire but i want a heavy duty LT235/75R16 TIRE
YES If same Manufacturer.
No, but the difference is small. You could compensate for the 1/4 inch difference in height by running the tires at slightly different air pressures. What do you mean by heavy duty? The 245 probably has a higher load rating than the 235.
LT (light truck) tires are designed around the same basic rules as commercial tires. They have sufficient reserve capacity factored into the formulas used to designate their max load capacity. P-metric and Euro metric tires, however, are not designed using the same set of rules. Their sizing system is designed for use on personal use vehicles which are normally less likely to be overloaded compared to a truck or commercial vehicle. When looking at the max load of P-metric or Euro metric tires being used on light truck type applications (full size van, SUV, pickup truck, minivan, etc) the tire's max load must be reduced by 9%. It is always best to stay with the vehicle manufacturer's recommended load range even if you don't plan to carry a lot of weight.
