=[ fix it.chances are it will not depending on the situation
if you lose a gear like me
its gone and theres NO WAY your rear or driveshaft will go.
its like having 1st 2nd then no 3rd in your case and then you have 4th and 5th
that chances are slim to none anything will happen to your rear or driveshaft
i cannot think of an issue that'll break either while your tranny blows
BUT on the other hand like me
my spider gears are F**ked. so when i turn while moving the rear end cluncks and bucks the car back and forth violently shocking my brand new tranny. that'll do damage.
luckily its opposite in your case