Hmmm I had some serious problems with my clutch which was rather costly, but it wasn't a problem with reverse specifically. I would have to use full force to shift gears. I'm talking both hands going down the road. It was okay when it was parked but once it was going, not so good. My husband's Jeep is a pain to get into reverse. He said the trick is to put it in 1st then to reverse and that seems to help. He said his old Corvette was like that too.
Is it grinding and trying to go into gear or just not doing anything?