I can't remember what I'm running in my Sterling 10.25" rear for my F250 build that I ran out of money and "GiveAFuck" to finish... 6.5" Skyjacker Double-Flex with Platinum Big Gas series shocks, 37x12.50r16 SSR's on 16x8 factory Alcoa bullet holes. Good looking truck.The 4.88 is as big as I would go on the D44. If you move up to a D60, then I would suggest a 5.38 or numerically higher due to the larger ring and pinion.
I think I went with 5.13 Yukons, but that was 10 years ago. They're still in that rear axle, and I'll probably end up selling it the rear axle separate from the truck, and putting another matching factory 4.10 rear that I have sitting around in it. It's a damn $4,000 rear axle with the Blackbird customs disc brake conversion, and Yukon 5.13 gears, REAL Detroit locker, Dynatrac diff cover, etc... That sucker is BUILT! If you break that axle with anything larger than 46" Michelin XMLs (or 54" swampers), you're doing something wrong.