This site has the GM part numbers and diagrams that may help.
https://nemigaparts.com/cat_spares/epc/chevrolet/54c-k/04/tc04-027/
Or if that doesn’t work, select your model and then expand the Automatic Transmission group...
https://nemigaparts.com/cat_spares/epc/chevrolet/
This looks like it’s for a CK1 with the L31, but double-check the RPO codes in the part number tables as they show various ones for 3/4 ton, 454, etc.
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I didn’t copy all of the table, but this gives you an idea. GM part numbers are in the right hand column. Model codes are broken out in parentheses, so for example a CK1(06-16) is a C/K 1500 Suburban/Tahoe 4-door (06) or a two door Tahoe/Yukon (16).
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Half ton GMT400 chassis models are 105 for a two-door SUV, 107 for any short wheelbase and 109 for a LWB. So a “CK 1,2,309” applies to any LWB truck (or Suburban) in 1/2 to 1-ton capacity in two or four wheel drive.
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