Turns out car grinds in 5th gear.. noice…When test driving the car I don’t know how but never came across it. What would be the best option to rebuild the synchro, or get á whole new tranny?

Are these motors really that strong were you can redline them everyday with no worries or nah?
(And this is for the N/A guys/girls lol)

Are these motors really that strong were you can redline them everyday with no worries or nah?
(And this is for the N/A guys/girls lol)