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no one that i know of has put a diesel in a NBS 1/2 ton. theres a place or two that does that coversions on 3/4 ton suburbans because they have the extra frame and powertrain strength, plus they have the extra room under the hood.
 

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19 Nav L BL, 19 S560, SL450
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The problem with 1500 comes to the tranny tunnel. The Allison tranny won't fit w/o a body lift (a large one at that). In order to do it you need to go with a 4l80, which is obviously a lesser tranny ( a good one all in all, but not against the allison). The frame is also not strong enough, nor the suspension components. The conversions I have seen come from a crashed 2500 duramax truck where they take the whole chassis and roll it under a burb or avalanche.
 
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