If you are trying to select reverse when still moving it does this. Reverse is not synchro like the other gears it is an idle gear which sits between the intput and output gears when reverse is selected, when you come out of reverse this gear moves out from between the two gears (input and output). If the car is moving the input and output ones will be and if you are selecting reverse gear when these two are spinning (ie the car is rolling) it will crunch as this idel gear is being forced between these moving gears. This is sometimes why reverse does not always engage easy, the teeeth on the input, output and idle gears are missalined - thats why you are told to drive forward then try reverse again
Gazza4
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