Factory body lift

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stutaeng

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Thought it also had to do with taller frame rails?
Yes, that's my understanding as well. On the GMT800:

2500HD/3500 trucks got the taller frame for the Allison, paired with the 8.1/6.6TD. Taller frame is also obviously stronger.

Non-HD 2500 trucks, vans and SUVs got the standard frame with either a 4L80/85e. None of those ever got an Allison, even if they did come with an 8.1 or 6.6TD.

I'm not aware of any body lift from the factory.
 
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