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Old October 13th, 2016, 01:00 PM
GMC_Dude GMC_Dude is offline
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Join Date: Jan 2013
Location: San Antonio, Texas
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Default 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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