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John H. · 01-04-2014, 02:12 AM

I have seen 4T in that location on all AC trucks. I have seen an S in the same location on a few non AC trucks. I assume it is AC but have not figured what the T stands for figuring the 4 is four season.

01-04-2014, 02:12 AM	#37
John H. Registered User Join Date: Oct 2007 Location: Sammamish, WA Posts: 2,115	Re: factory grease pencil marks? I have seen 4T in that location on all AC trucks. I have seen an S in the same location on a few non AC trucks. I assume it is AC but have not figured what the T stands for figuring the 4 is four season.