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<p>[QUOTE=&quot;underpsi, post: 795254, member: 20690&quot;]Sorry didn&#039;t know we were just talking about michigan trucks. These truck just ran all over Ontario Canada. The two speed unit is part of the front rear diff, its air operated. You can switch from low to high while going down the highway but only switch from high to low when completely stopped. So the whole idea of them is really startability. You can have 5.60&#039;s or whatever the ratio is to start off and have 4.10&#039;s to cruise down the highway at lower engine speed. I believe the way it works with the ratio&#039;s is it all matters what the high gear is so if there way like 3.70&#039;s in there the low side would be like 4.56&#039;s[/QUOTE]</p><p><br /></p>

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