I was “ok” with just the gears. The trans would hunt between 7-8 every once in a while while cruising at 70-75mph. But I’ve got a heavy rig on 4.5” lift. The tune added roughly 1-2mpg since it will hold 8th way better.How did you like 4.88 gears before the tune? Did your MPG increase? I keep going back and forth between 4.88 and 5.13. I was leaning towards 5.13,. Maybe it be better to go 4.88 to bring it back close to stock and add the tune like you did.
It all depends on how much your rig weighs and where you live before I’d recommend 4.88 or 5.13 gears. I’d still like to do 5.13 to help compensate for rolling weight, wind drag and interstate hills. But, I’m content with 4.88 for now.