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Having sorted the clunking noise on the transfer box, Now been having trouble with XYX switch on the auto-box.,. We think we may have disturbed the cable while investigating the clunking noise. As usual we have tweaked the cable connection on the XYZ switch lever a few times and now it works fine - the display on the dash matches the display on the selection lever display in all positions in low and in high mode. Just been out on a short shopping run, pulled into the drive which slopes downwards steeply. Driving in low ratio everything was fine both displays showing park. I took foot off the brake and the old girl rolled forward with a slight ticking noise that we've not had before. Any ideas why the car can move when in Park and the source of the ticking noise??? Cheers Mike

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When you put it in park a lever moves into a slotted wheel on the output shaft and it sounds like it isn't fully moving into Park. You've got two adjustments there, the cable itself that changes the gears and the XYZ switch which shows what position the cable and lever are. It's on slots so you can adjust it to get them to match. If you have been adjusting the cable to match the XYZ switch, you are doing it the wrong way round. You adjust the cable so the gears engage fully when the interior gear lever is showing where it should be, then adjust the XYZ switch so the lights and dash match where the lever is.

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Thanks for the quick response. I'm not sure that I understand it, can you clarify it?
You say that "You adjust the cable so the gears engage fully when the interior gear lever is showing where it should be". Does this mean that we set the cable so that the Selection lever displays shows the right warning, then set the XYZ switch to match the display. If so - think that's what we did but will check that bin the morning when it's cooler. OR is there another way to make sure it is in the right position??? Cheers Mike

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Put the gear lever in Park then go to the lever on the side of the gearbox. You should be able to move the shaft the lever attaches to a little so make sure it is hard against the internal end stop, that will confirm it is fully into Park. Run though all the gears, or better still, get someone else to do it while you lay underneath and you can confirm the shaft the lever is attached to is clicking into each gear. Then check that the lights and dash correspond with the lever position. If they don't, you slacken off the nut and bolt that secure the XYZ switch and turn that one way or another until they do.

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Thanks for the clarification. I sent a copy of your first response to my brother who has spent more time underneath the old lady and he understood what you meant. The clarification helps further. Will try it out first thing tomorrow if its cool enough. Apologies for the typos in the earlier posts, I seem to have a keyboard that adds letters of its own accord. Usually I catch them before submitting but its too damn hot!!!! Thanks once again for all your help.. Cheers, Mike

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SOLVED
Followed Gilbert's advice and it worked like a charm - now onto the next problem!!!!!! Thanks GilbertD for all your advice. It is much appreciated. Mike