Quote:
Originally Posted by jimijam00
I thought GM put TH400s in the higher HP engines to handle the power, and not not whether or not a truck had a transfer case. But because of the Rona, I haven't stayed at a Holiday Inn Express since March of 2020. I've got the original TH400 in mine, and shows M49 on the SPID too. Original engine was a 350.
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It doesn’t really make sense that GM use the same M49 code for the 350 & 400 trans, but it appears that’s the case. My truck has the original TH350 in it along with 350 engine, and has M49 on the SPID. That’s what I was going by, as well as the info packet from GM heritage center.