Just so it's clear.
You have a truck with a lift and little bitty 28 inch stock tires. The frame at the crossmember is 23 3/4 inches off the ground.
I have a stock truck with little bitty 28 inch stock tires, and my frame at the crossmemeber is 15.5 inches off the ground.
That means you have an 8.25 inch lift, which you know you don't have.
Is this correct so far?