Jumps into reverse sometime. Please help

[Mugzee]

I would make sure the correct filter has been fitted. I experienced an intermittent slippage fault at low speeds immediately after I serviced the box (it drove fine the rest of the time). Turned out that the "A" version of the filter had been supplied instead of the "B". The pick up tube on the filter was too long and was causing oil starvation. I then fitted the correct filter and it now drives as it should.

[Dezzy]

Another thing to check is the adjustment on the gear selector, it has to be disconnected from the box, may just need a little tweek after being removed.

[fireman dan]

Many thanks for all your input.

Will keep you updated on my findings.