Need a little advice, 2003 Century 12.7L Detroit Engine 430 hp

ck 4 smog box EGR under hood if yes run

 

12.7 Detroit is known for being one of the best out there... Great fuel milage and cheap to work on... If the price is right and you like it i say you should buy it...
Good luck and let us know if you do get it....

 

My 1999 KW has a 12.7 Detroit S60 engine in it. 1,156,000 on the original engine.
No overhaul yet...runs and pulls great....I barely even burn 1 gal between oil changes.
You can't ask for anything better...

The only issue with these engines? - The dam bull gear. Hopefully it was replaced at your overhaul.
DD recommends replacement at 750k...mine is still the OEM original. That's kinda scarey.

The Bull gear replacement by itself is 17hrs of labor and parts....About $2500 or so pending.

PS. You could consider a rig like a Kenworth that will last much longer than a 'fleet' truck
but I know costs can be a consideration too...

 

Everybody keeps talking the bullgear, the 3 Detroit shops I frequent for advice and parts have all said, that they have only replaced and seen a few dozen that had come apart.......

 

s60 12.7 are know for bull gears going out at high mileage. I to am working on a high mileage one. 3 million miles and only second gear in her....that's scary.

as for fleet truck kenworth makes fleet truck also. every truck is a fleet truck. still the same motors rears and tranny same plastic just different designes. my old girl is a 1996 freightliner classic. needs a good paint job at this point in her life but what wouldn't after 3 million miles and climbing if I can get a load tommorw...lol

 

I have an 06 with 850,000 runs like a champ and uses zero oil. Getting an overhead this Friday.

 

what kind of fuel mileage does a 96 classic with a 3406 get? I drove them but don't remember. I found a nice one and was wondering. Oh it has 10 spd. Thanks

 

5-6 average.....