Direct vs. OD setups

Last company I workedfor had an '02 379 with a 15 "Double under". Split the low end for heavier applications.

 

newer truck have more thing to go wrong they have emission parts that older trucks not have

these new parts are more expensave to fix than old truck are best to keep older iron is much cheeper

 

Clutch doesn't need to be any beefier -- the engine is putting out the same torque. It is everything from the output shaft to the tires that is getting more torque. So yes, you will have increased drivetrain wear, but the fuel savings ($2,100/year @ $70,000 annual fuel cost) will more than make up for it.

 

Yet another advantage of doing the glider truck thing. Best of both worlds. New equipment and no emissions stuff.

 

I would have agreed with you, but I want to run a green company. To claim i am green, i cant run a pre emission truck. Secondly, my "old iron" is costing me almost .30 a mile in repairs. Old trucks are generally cheaper, but a lot of old stuff breaks. Nothing major, but motor mounts, starters, altinator etc...it all adds up. A glider isnt a bad idea, but still, no DPF means its not as green. Also, when working properly (thats a big WHEN) the newer trucks have better aerodynamics then the older ones and thus the potential for better mpg. Lastly, many drivers like new trucks. If im hireing drivers, that cant look after an old truck and do some work themselves, they may liek the new truck more.

 

direct drive trans. and air tags axles are not cutting edge tech. freight co.s have been playing with them since the 70's with miner suscess. Only thing new about it is you have 750 ci. motors putting out 450-500hp that will lug to 1100rpms. Major down side I see is your spec ing out a truck thats only good to cruise interstates and not much else.

 

See the http://www.thetruckersreport.com/tr...s/251784-looking-to-change-my-axle-ratio.html. We argues for 25 pages about this. But, if you believe me, cowpie, orallan5oh....then you will relize there is no difference. Assuming a direct trans with 2.64 or a od trans with 3.55....you will have same off the line, same power up hills, better power in top gear at cruise speed. but, read that thread and you can decide for yourself, The math of why is int he first few pages. We do not need to beat the dead horse that was already beaten after he died.

 

I have a 2015 cascadia evolution with direct drive transmission FR15210b and rears 2.64 Merritor
And I’m changing it to FRO16210B and
3.58 Merritor
Truck is being used in Asphalt and other heavy haul materials
Does anyone have any recommendations or do I have to do any programming