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Old 08-12-2016, 09:14 PM   #3
SilverMiner
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Join Date: Oct 2005
Location: North Idaho
Posts: 335
Re: What is this on my floor pan?

Nope, never a diesel. A regular old 350/TH350C/NP205 combo that they made millions of. I bought a copy of the build sheet from the GM Heritage Archives and everything checked out original except the gear ratio.

You are right though about the diesels getting the super soundproofing treatment. I had forgotten about that and will use it to search for more info.
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1980 K10 Suburban Silverado, original 350 w/Qjet swapped to 406sb, TH350C swapped to TH400/205
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