could a silverback gorilla win against a grizzly bear?

Not a chance. The bear has a mass more than three times the silverback and has an arsenal that rivals that of the gorilla.. I'd give the fight 30 seconds before the silverback is dead and/or mauled. The only land animal I can think of that would easily beat either, believe it or not, is the moose. With the silverback, I'm pretty sure a Bengal tiger could take it down.

No , a grizzly bear is far stronger and heavier

No, not a chance.

Against a cub yes. Not against an adult.
Adult grizzly is too big, too strong and have massive canines with a deadly bite and on top of that massive claws.

Silverback Gorillas fill a niche where they are too dangerous to kill due to both their numbers and size as adults. They can defend themselves from African Leopard attacks, a powerful cat 130lbs [males] when adult.
Male grizzly can weight 600lbs.

Silverback gorillas are not built to survive that type of predator. While they live in Africa, they are forest animals, they don't live in the Savannah where far more dangerous and potent animals live.

Size matters. It's like putting modern elephants/rhinos in late cretaceous north America, it wouldn't go so well.

Too much respect for eachother to test

Possible, It would be one hell of fight

i know you. you are from quora.

and i say it can go either way.