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Its not a height thing, its a tolerance thing.
From memory, the tolerance for the suspension height under normal conditions is 10mm. In TTM the tolerance is reduced to 3mm. This makes the setting more accurate but requires more adjustments by the system to keep the height within tolerance and hence more wear.
My numbers may not be right, but that's the principle.
Cheers,
Jon
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1 Attachment(s)
This is the TSB for TTM that came out in 2006 - explains what it is, how to enable it and when it should be used:
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TTM
Pehaps the Technical Bulletin should be mailed to the Service Department in question and also copied to LR Australia with the annotated invoice for clarification.