i have a 07 yukon, i tow about 7k lbs and have a 3.73 gear, im looking to go to 4.10 or 4.30, i have 32.6" tall tires, i have done the calculator but can anyone post up what they see driving with say a 4.30 gear at 65-75 mph,

 

I know its a calculation, but with the 32.6" tire, .70:1 OD and converter locked with 4.10s, you should see
4.10s 67@2000 85@2500
4.30s 64@2000 81@2500
4.56s 61@2000 76@2500