You can up that to 430hp and get 3.55-3.58, you will be absolutely fine. 1500-1600 RPM at 70mph is good, below 1400 is not.
N14 with 3.91 gears, 10 speed. Change to what gear?
Discussion in 'Ask An Owner Operator' started by Asalinas2y, Sep 20, 2023.
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The key is letting the engine “breathe” let it work in a spot were it is not being force fed air and heat. Low manifold pressure is best. Running with the turbo spooled up all day just kills engines. I can cruise 1900 rpm at 65 all day and barely make 10 psi manifold 50 on fuel pressure and 600 degrees on pyro and get job done just fine. Rto 13 speed 4:11 rears. Still have plenty of throttle to get outa the way if needed.
Dadetrucking305 Thanks this. -
tower should be the same, it was under $1000 excluding the trans to swap the last one we did and we paid someone to do it -
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What CPL is the N14? What size tires are you running? The N14 isn’t one to pull down below 1500 RPM, they need to stay in that 1500-1900 RPM range to live a long, happy life.
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IMO if you're replacing the rear end strictly for fuel economy you're wasting your time. 7.3 mpg is very good fuel economy IMO. I doubt the gains you'll see will offset the cost for a very long time.
Unless you've already got the carrier assembly laying around or you've got a lot of miles on that diff I would just run it as is until its time to replace. -
If you’re really getting that mileage I wouldn’t touch a thing. Those Rpm won’t hurt it and as others have mentioned low rpm wears the main bearing caps making the block junk or very expensive to fix at overhaul time
Dadetrucking305 Thanks this. -
Leave it be.That fuel mileage is very good especially on a non aero truck.Keeps the rpm’s up and doesn’t lug the engine.
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