[brycey2004]

These are what im looking at 2000-2004 cost $30-40k, milage 500k or less
KW t600
Freightliner Century class
pulling van or flatbead

what engine, hp, ratio, gears etc? for best mpg 60-65mph
what to check b4 purchase?
where to buy?
extended warranty worth anything?

ive been doing alot of reading on here, would be nice to get all this info under one topic, im leading towards a kw t600, 430hp, 10sp, 3.55, mid roof, all comments would be appreciated....
Rich

mpg is everything!!

[allan5oh]

If you're going with a 10 speed, get a direct drive 10 speed with 2.64 gears. Run 22.5 lo pros (XDA energy for the drives) or super singles. With a detroit 430 hp. That would be the most efficient operation for you.

When you find a truck, pull an ECM report first thing. If it shows anything less them 6 mpg, run away. Look at codes and other stuff too.

Do an oil sample, and get an independent mechanic to check it out. You might want to do a "shake test" as well.

To be honest, ex-schneider trucks would fit the bill perfectly. But you'd probably prefer a flat top.

http://www.truckpaper.com/listings/d...456D27BFF01B7F

There's a non-schneider truck with those specs. I can gaurantee if it's in good mechanical shape, with the right tires, and driven properly, it will get 7.5 MPG.

Just to qualify, a direct drive transmission is more efficient. It will save you about $2000 a year in fuel costs. A direct drive with 2.64 gears is actually the same as the specs you were talking about(3.55 gears).

[allan5oh]

Another tip:

Go to truckpaper, into the search, and type in "2.64" in the keyword search.

175 trucks will show up.

I'd also recommend a 2001-2002 truck.

[allan5oh]

http://i130.photobucket.com/albums/p...13speed355.jpg

http://i130.photobucket.com/albums/p.../direct264.jpg

Just to give you an idea of what it would rev.

[merrick4]

Hey Allan (sorry to hijack here) but I personally still don't understand the gear ratio etc but I'm reading what you write and I just took off the cover on the dash and it says:

455/525 hp/ 1800 RPM, 2100

and I have a 3.55 gear ratio and a Detroit D 60 engine 14. L

What is it with the RPM's? I never run it at 1800 or 2100 unless I'm going downhill ? I run at 1400, am I doing this right?

Also btw, I just got the results back from Blackstone on my latest oil sample. It all looks good but they were basing it off a 12.5 L engine I need to call them to see if it makes a difference.

Thanks

[allan5oh]

1400 rpms is good for that engine. How fast are you going at that speed?

You only want to be above 1600 rpms going downhill with the jake on.

The rpms is just where you make PEAK hp. You don't want to be there though!

[merrick4]

Man that was fast! Thanks! As for the speed, depending on my mood really between 62 and 68.

Just out of curiousity what happens when you over rev an engine?

Also for the above mentioned specs that I have, I assume this is geared to fuel efficiency? It's a Frightliner Columbia. My thinking was that these big companies spec these things out for fuel efficiency (it was a Covenant truck).

Thanks again I appreciate it.

[allan5oh]

You have 22.5 lo pro tires right?

Over revving an engine is impossible EXCEPT if you're going downhill.

My engine revs to 2100 on the foot, and it is safe that high otherwise they wouldn't have designed it to do that. I take it up to 2000-2100 using the jake. Mercedes need to go to 2500.

[brycey2004]

thanks for the input guys.

[merrick4]

Well I checked and they are 22.5 and the steers say low profile. They are Bridgestone and the drives are General. I don't see low profile on those. They all came with the truck.


I am 30 miles from home (man a long time, only been home 1 night since September I think) and tomorrow I am going to get those cat's eye things installed to equalize the tire pressure. Do you feel this is a worthy investment?

Also if it's safe to rev the engine up that high why does everyone say not to? Is it more of a fuel economy thing rather than danger to the engine?

Sorry with all the questions ops: