Reverse gear lockout
 

I have an 82 928 5 speed and I read through the owners manual and noticed a reverse gear lockout, meaning you have to shift in neutral between gears 4 and 5 and then back to get it into reverse? My car doesn't do that. In fact, sometimes moving from 1st to 2nd, I accidentally grind it against reverse. I really don't want to do that so I was wondering if there something that I can fix/ replace that is in the linkage or outside the transmission or is this something internal to the transmission that I can't fix without completely tearing the car apart?
Thanks.
Brian

the lockout spring is inside the trans,
not easy to get to

cna someone explain the lockout in to reverse,, my car is been sitting for 4motnhs now if i running the car idling in park, and try to shift in to reverse it grinds? thats mean my reverse is lockout? how i release it??? my car is 83 manual tranny, main cylinder slave cylinder clutch pedal all feels normal, car was ok 4 moths ago