ECL Codes, why so much confusion?

[Jeff H]

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I thought the window codes for a TH350 would be M38 vs. using M40 as a generic indicator

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That's what I thought as well. But remember, on the ordering sheet, the 4 speed was simply listed as a close ratio or wide ratio and not M20 vs M21 or M22. So the generic order would be for the turbo hydramatic transmission, not actually specifying the TH350 vs TH400. The paperwork Ed has is great and goes along with Jerry M's paperwork to help validate combinations and codes.