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New Duramax owner

825 Views 10 Replies 4 Participants Last post by  Bodysurfer, 
G
Just wondering what RPM should the motor be running at when the truck is traveling 60 MPH? I know the truck is a 5 spd. auto, but it just seems like the truck is in desparate need of another gear on the highway. I think at around 60 or 70 it's running 2000-2100 RPM's, could it cause damage driving faster than that??
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Bodysurfer
With my setup (listed below) on flat freeway:

75 mph
2000 rpm
700F egt
3-4psi boost
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