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03 freightliner century 390 rears 10 speed

OK just bought this freight liner it has 22.5 low pros it has the 500 horse detroit 390 Rears should i run this truck in 9 th gear? Is that direct? Ive asked around and searched the website im planning on driving slow thanx

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3:90 ratio is pretty low geared, probably run it in tenth and only go 60mph.

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My truck has 11R24.5 with same rears 0.73 overdrive equals close to 1370 rpm at 60 mph.

Direct it would turn at 1860 rpm, just a wee bit too high.

Yours would turn at over 2,000 rpm in direct.

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OK thanks how slow would u have to drive to run ninth. I keep hearing direct is the most efficient

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Buy a scan gauge for 200$ and it is like a crystal ball for your dash. I'm not joking. It will change how you drive the truck constantly! Every minute calls for adjustments.

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OK I'll look into that thanks for all the good info

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Your will be eternally grateful.
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