In one of my early cj7's I ran 33" tires with, 4.56 gears, a lock rite and auto trans in my dana 30 for several years. There were the early Sledge Hammer days before anyone really rock crawled. I was hard on it but careful. Others broke axles and outer u-joints but I didn't. They were pretty much heavy footed with manual trans. The rear 35 diffs, well lets just say by the time you built them you wish you just did a dana 44. Again though, I saw those hold up with 4.56 and 4.88 gears, detroit or loc rite lockers if they were careful.
I started attending 4wd events in the later 80's. Pretty much everyone had jeeps with 30/corporate , 30/44 or later 30/35. Everyone ran 33's because 35's weren't popular yet. I would say the C-Clip 35 was the weakest. This means I've seen hundreds of those combos being abused off road.
Later with the TJ's the only dana 35's I saw break were people with 35" tires and a real heavy foot. Almost all of the axles I saw break were stock with a locker and a heavy foot.
Personally, I always buy chromo axles for everything and a 4.56 works well with a 33" tire with 4.10 is as highest giving a bit better street. I no longer run limited slips and fixed lockers (Detroit, tru trac...). I only run selectable. Street, turning on a hill and slippery side hills are why.
Don't know how you drive or what terrain type you like. This is my experience in the Cal desert and forest trails including Rubicon and Dusy.
Heres a pic of my 79 CJ7 in the later 80's with a mechanical locked dana 30, 4.56 and 33" tires. Like I said, the dana 30 held up to me.
