I run an 8.8 with 5.13's with Spidertrax spacer/adapters that pushed it out and changed BP to match my swapped in HPD44 for the front (Albeit, my front's a '76 F150 D44 and i had to have it shortened a bit so i could use rubicon shafts....
In any event, my tires are 37's. I wish i would have went lower. I think 5.38's would have been ideal. Ah well.. You learn. I don't do allot of driving so it's not a big issue.