Re: transmission swap
A couple of thoughts. If the online calculators give you an answer you know to be wrong the most likely reason is bad inputs. Given the inputs you've listed, I suspect your ring and pinion ratio is way off. On A 5500 GMC truck I would expect the ratio to be more in the 6.10 range. Does this truck have a two speed rear end? That needs to be factored in as well.
Darrell Hein
San Antonio
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