Input shaft - life left or replace?

You might get away with it... But teeth like that not only effect the shift into high gear but also can cause it to pop out of gear.... It's available, in the past availability was always a problem... If you are strapped for cash patch it, if you aren't a starving car guy replace it...

Availability is keyword on that particular choice gear.
I've had to spray weld the brg surface and dress teeth as shown, to make a trans serviceable, cuz of no availability.
Glad it's avail .
Never had a Mopar trans pop outta gear.
Cheers .