As far as I know this is the 6 speed box. At present you could be correct regarding the 5 to 4 shift although I have not checked it out by using the manual shift to check what gear it is in immediately after the jolt/jerk. If an opportunity arises I will have a go but may not get much of an opportunity as I am 'stuck about town' much of this week with very few miles expected.
I intend to post back on the results of the Marshall's investigation.
Cheers, Phil
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