Any pre trip -services we do, we change to MTF94 if they are heading north. Even some of our customers who live down here require it to aid in shift quality, some though can use only Dex3, or cold shifting is poor. It is also worth mentioning here that not all R380's etc are the same, some even late ones will shift better with Dex3, and some will only be able to run MTF94, I think the assembly quality control regarding endfloats etc is a bit hit and miss, we seem to be getting more D2's and Td5 fenders with poor quality shifts than D1's now....
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JC
