Cheapest way to change ratios on an 8-3/4, and what ratio to choose?

i just did the 8.8 explorer swap n was running 3.73 s the car was twistn up pretty high crusing 70 on interstate so i went to 3.55s it helped some but with a 26 inch tire it was still a lil hi i have a abundance of 8.8 stuff so i again swapped the gears this time to 3,30s i am very content with em car feels good still but can cruise 70 75 mph n not feel like your killing it twisting it so hi for long periods a time. i work 20 miles from home n its all interstate speed limit is 70 n doing 70 people still buzz right by lol i felt like i was impeding traffic at 55 n 60