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04 RR V8 motor the car drives and shifts perfect in all forward gears all the time. When you first start it up reverse works etc. Once its been running for a while it knocks to engage reverse and it just doesn't do anything when you hit the gas. It keeps trying to engage but nothing. Nothing comes up for transmission codes or anything. All forward gears drive perfect with no lag or anything. I know this is a ZF transmission which means it must have a huge issue with reverse like the BMW 740 had. What is the repair for this?