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.
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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