I have spotted an issue on my van where the gear lever moves when coming on and off throttle. Before anyone starts calling it as a gearbox/engine mounting issue I need to point out that this is only happening in 6th gear. In all other gears it is completely stable.

2007 3 ltr 160 BHP unit

Has anyone else got/had this and had it successfully fixed or diagnosed?

My van has 23,000 miles on the clock so it really shouldn't be a "worn out" gearbox. Unfortunately this was spotted by the dealer I am trying to part exchange with and has put the deal on hold. I hadn't noticed this problem until they pointed it out to me

My 62 plate 3.0 euro 5, with 194000 miles, has always had a small movement (forward and backward) only slight, can feel it but hardly see any movement, when pressing and lifting, it's a torque thing, mountings should have some flexibility