Cab sticker says 60 psi front and 80 psi cold, probably correct for a loaded truck but most of the time mine is empty rides really stiff? 265/70/18 E Michellin ATX2, I think the rear could be dropped to 60 psi as a starting point? I couldn’t find any info on the tire manufacturers websites?
The truck is a 6.0L gas engine not the duramax.
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