Redhead lists the 1500 gearbox for the 97-99 as different part # than the 92-96.
I have both a 94 and a 98 GM also lists them as different but same housing, and a 3rd part # for 96.
I'd be willing to bet that the only difference between those part numbers is something small. Wholesale GM Parts Online lists the same gear part number for a '96 and a '97 C1500, 26068855.
https://www.wholesalegmpartsonline....odel=14486&modelYear=1996&ukey_category=19404
https://www.wholesalegmpartsonline....odel=14486&modelYear=1997&ukey_category=19404
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