I have not run mine yet, but chose 4.88 basically because I have to only having a 4banger. I think I did a decent amount of research on Dana 30's breaking pinions and couldn't find much. I read stories of people running them for years with out problems. Also stories that some didn't even get though their first trip out and bang! I talked with the gear guru that did my work. He told me he has never had a problem with them and has never had to warranty any ether. In a nut shell he told me they were just as strong as 4.56's if you buy quality gears. So I had him install Yukons in the front axle.
Dave