My 930 makes a clicking noise from the back of the car, only in reverse at slow speed. Does not occur in fwd gears.
Background, while climbing in the backseat, one of my kids pushed the shifter into the reverse gait. Just made a grinding noise for a split second. Car runs and shifts great.

 

Drove me up a wall, pulled the tranny, had it looked at, the reverse gear had some wear on the teeth, replaced. Everything else looked pristine....still does it.

 

Any ideas?

 

Mine doesn't click, but it will grind if you don't put it in second prior to shifting into reverse, then it engages smoothly.

 

Chris, does it happen when going straight back, or while turning and backing up at the same time. If only while turning and backing up it could just be the LSD. My 930 does it some, my RS much more because of Cup car LSD

 

I would assume both, I'll check.
But, it clearly does it going straight back.

update, does it both straight and turning, r p ?

 

Im going to guess not the LSD then, but I presume that you would hear the R&P at all speeds, forward and backward.

 

Only in reverse. Reverse gear synchro?