Question about 13spd & 3.90's

I'm looking at an International 5900i Daycab that has a C12 Cat 430 hp, 13 speed, & 24.5 rubber. I was wondering if anyone out there has had or does have a similar drivetrain and could tell me what kind of RPM's this truck would turn # 65-70 mph. I haul pulpwood and never go more than 250 miles round trip, obviously I'm out in the woods alot where the going is slooow & rough and think this set up may be nice. I'm just afraid the truck will be screamin' # 60 mph? Any feedback is greatly appreciated...

 

Sorry, i posted it in the title but not in the question. It has 3.90's, I'm not sure if its an OD or a direct tranny, waiting to hear back from seller. Can you figure for both? Its an '02 tractor if that matters...

 

I hate to assume but I can't believe it wouldn't be an OD with 3.90's...I really like this truck & this is the only deciding factor. It only has 162k miles on it and looks beautiful in the pics, hopefully they get back to me w/tranny model # soon...thanks alot for your reply, what would you need to get the engine history...VIN # ?

 

Well I bought the 02 Int'l I mentioned earlier in the post, really nice truck but am struggling with the Super 10 to 13 spd transition...I have the most rouble going from 4th to 5th. I pre-select high range but it doesn't want to come out of gear unless I clutch it. Any one else had this problem? I've also noticed that the C12 has a very different engine brake, I have to hold the brake pedal for a couple seconds before it engages, is this normal? It doesn't always ingage then either, with my N14 when its on, its on.