What was the question again? Regarding accessories?
How did the C3500HD and the Kodiak with the factory 8.1 accessories work? I thought those mounted the AC compressor high similar to the position of SBC/BBC?
Correct, top driver side A/C mount just like a 7.4 Vortec. Wild guess? Probably their own unique accessory drive brackets for a GMT455 w/8.1. The 3500HD was mostly a "parts bin" design pulling things off the shelf that already existed for other models, but that doesn't necessarily rule out a few special-made parts, IMO. I mean - they had to come up with engine harness, stuff like that for these trucks. Also keep in mind while the U.S. only got them for 2 years, they continued producing them for the Mexico market for several more years with the 8.1 (and 6.5td) - through at least 2006 or so.
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Richard