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I just learned something on my Allison. If you hold the TH Button in for about 2 seconds, it will lock out overdrive, and still not be in TH mode. I was told this was new for 2003. GHas anyone else noticed this?
 

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Yep :) I figured it out when test driving it. It also has symbols on the gearshift exlaining it and is also in the owners manual.
 

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That is one of the features on an "03 that I wish had of been available in '02 ... Jim
 

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You can add a button to do it. Similar procedure as doing the high idle.
 

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It's a nice improvement to the transmission for 2003 models.
 

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That's more than Truck Trend magazine could figure out. In a head to head test against the new 6.0 PS they couldn't even figure out how to activeate T/H mode much less the OD lockout on the Allison.
 
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