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i have an 04 2500hd crewcab with a 6.0l gas engine and 4:10 gears. what rpm should i be runnin at 80mph with no lload

 

 

 

 

 

I have the same truck. When I had 245/75R16's @ 75 mph I was pulling about 2500 rpm's. I now have 265's and at 75 mph I pull about 2450+/-. I don't get to 80 very often, but my guess is that it'd be somewhere close to 2700 rpm's.

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