Interesting, I wonder how many boxes have been damage by MOT testing etc. What age discovery's had the above autoboxes in? I'm thinking about buying an old Range Rover, I assume these will have the same boxes in as a Discovery?
Personally, I rarely rev the car in P/N unless there's a valid reason to, such as checking the operation of the dual ram intake valves and when I had a misfire a while back. Well, besides once when I had the exhausts removed from the cats back... you just have to wake the street up! 
Yes putting the car into a gear when revving is going to cause problems and is a big no-no.
Ashcroft Transmissions have details of which is in what:
http://www.ashcroft-transmissions.co.uk/index.php?act=viewCat&catId=6*see their FAQ pages also.
The Early Discos and Rangie Classics have the ZF 4HP22 which is known to have the problem.....I think the later EH (electronic converter-lockup) variants fitted to the Disco II/TD5/V8`s onwards etc. are less of a worry.
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Topic: Reving autos in Park (Read 2454 times)