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.
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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.
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.
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.
Actually Gohan goes super saiyan 2 in the episode The Unleashing.
gohan turns super saiyan 2 in episode number #170 It's actually DBZ Episode 185-Awakening