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I have an 85 C/K service manual and an 88 R/V/G/P manual. they are very similar to above: First digit, Nation of Origin 1= US 2=Canadian 3= Mexican Second Mfr, G= General Motors Third, Make, B= Chevy incomplete (M1031) C=Chevrolet Truck (p/us, blazers) Four, GVW, G 8001-9000, H...

The difference for the 3rd digit is a B is for Chevrolet, incomplete (like an M1031), C is just chevrolet truck. (like an M1008) This info is found in Section OA-2, general information in any GM service Maunual.

I have a true M1028A1 with a "G" where the "H" is. The G makes mine a 1986, the H makes it a 1987, nothing to do with being an M1028 or M1008. The F after the H means it was made in Flint.