How strong can a fully grown gorilla be?
I have to ask what type of lift you are asking. Is this a
deadlift, a military press, or a 1,000 lb "budge"? Two of the three
should be possible for a gorilla. Depending on the rules, the human
record deadlift is near/somewhat over 1,000 pounds. A gorilla is
considerably stronger than a human, though experiences none of the
conditioning of a weightlifter. A "budge" of the weight would be
easy, i.e lift it at all. The human backlift record is over 2 tons.
A military style press (over the head) might be too difficult.
Gorillas are not fully upright and thus the spinal column could not
stack vertically to support the weight. In effect it would be
carrying a massive weight at a lean. I doubt if a gorilla could
lift this.