Technical Reverse gear noise

[Stinker]

Hi guys,
Another problem reared it's ugly head last night, and I hope it's not a car killer
I was putting the car on the drive, and as I started reversing, there was a crunch, and then some grinding noises underneath somewhere when moving in reverse. I went out to take another look this morning and I couldn't replicate it, all seems fine
My initial thoughts were possibly gearbox mountings, does this seem feasible?

 

[BikeDoc]

Could it have been something simple like the tyre rolling over something on the ground?

Another possibility is a stone or bit of gravel etc got in behind one of the disc guards.

A knackered mounting would give more of a 'clonk' than a grinding noise.

 

[widemouthfrog]

Perhaps it just because it wasn't properly in gear?

 

[Stinker]

Some of the above are possible, the first thing I did was check the road, there was nothing there at all. I was quite sure that it was in gear properly as tried it twice. There is a clunking over bumps sometimes, but I put this down to the exhaust bracket being lose near the front.
Needless to say it's been perfect today

 

[DiamondDave]

Turn up the radio!

 

[bubble bus owner]

Our 07 plate been doing this for a while wondering if it's a clutch problem - be interested to see if yours keeps doing it

 

[barryfiatman]

maybe as has been said already? To be safe I would put some molyslip in the gearbox and also check linkages for a stiff joint.