No, not in the authentic series, just only in fan made ones. In the actual story, only full blooded Saiyans can turn into SSJ 4. There are knockoffs and side stories made by fans and unofficial groups, but the real Dragonball, Z, and GT series never feature him surpassing Super Saiyan 2 aside from unlocking his potential. There may be pictures of him as SSJ 4, but the series never mentions it.
There could have been a Super Saiyan 4 Gohan, but since he doesn't have his tail anymore, he can't turn into an Oozaru and then Super Saiyan 4. If Akira Toriyama did come up with the Super Saiyan 4 from earlier, he would have already in the movie: The Tree of Might.
Only pure Saiyan's such as Goku, Bardock, King Vegeta, or Vegeta could turn into one, although only Goku and Vegeta used it in the TV show. It was never revealed if King Veteta or Bardock could use it. we can only assume that they couldn't because if they could it would done them a lot of good to use it against Freza before he killed both of them.
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Gohan is the strongest saiyan on dragon ball. Not super saiyan but normal form saiyan. Only not best super saiyan because he can't go super saiyan 4.
No, Super Saiyan 2 is as far as he goes, he never becomes Super Saiyan 3 or 4.
160 is when he first went super saiyan 2 after training with goku (his dad) as a super saiyan 1 he was angry because cell killed so many people and killed one right in front of him so he got angry and went SUPER SAIYAN 2. P.S super saiyan 2 is the highest super saiyan gohan can do but in dragon ball AF gohan goes super saiyan 4 and goku goes super saiyan 50 that is all i can tell you.
Gohan is stronger if goku is in his normal form but if they are both in super saiyan 2 form or if Goku is in super saiyan form then goku is stronger.
According to DBGT, Gohan couldn't go super saiyan 4. Because when Baby fused with Vegeta, they couldn't obtain the power. You would to have the lights emitted of course, the tail, AND full saiyan blood. Which is why Goku and Vegeta have obtained it. Gohan is 1/2 human making him impure and he wouldn't be able to go Super Saiyan 4. Of course DBGT is not made by the same person. So one couldn't say.