3.42 gear ratio

They all leak lol. I know one guy that dropped his off at Freightliner at the 650K mark, I think he had a clutch done, and it was there 3 or 4 days, and everything dried out. They started it up, and it pissed oil everywhere lol.

I don't think the replacement tunes are metal. It's just after so many miles of bad road, the constant pounding, they snap off.

It's common enough that many repair shops stock those pick up tubes, and pan gaskets lol.

 

I pulled 100’000 lbs through the Canadian Rockies with that same setup in a 2009 cascadia it did fine... pulling 80k it won’t have a issue at all

 

I like it lower too, but my engine doesn't. It's a ddec2, and the sweet spot is 1,600. It took a little getting used to after driving big engines that you can pull down to 1,000 and like to run at 1,300.

 

IDK, 3:42 getting pretty high, I drove a '99 Columbia for a friend, 500 Det., 13, 3:55, small rubber, and I tell you what, I hardly ever used the big hole. Trouble gear, it was. Rockin' out to a song or yakkin' on the radio, look down, and going 80 mph. I just left it in direct.

 

That's my intention. To save the big hole for those places I never see, like big down hills in Wyoming.

 

3.42 is not crazy at all. Whatsoever... Seriously

My new truck was ordered with 18spd and 3.08 rears. 1300rpm@68mph.
Peak tq is 1150rpm.

3.42 w/ your 13spd od is still turning a ton of rpm for a modern motor. That would be a touch low for a old motor.... Still nothing crazy but not very low for the new engines with much lower rpm peak tq.

Again i run gross # frequently with a little Volvo D13-XE 455 high tq.

1300@73mph
1200@68mph
1100@63mph

It still passes 90% of the trucks on the hills with this setup... Don't buy the bs that fast rears won't pull, it's all about the total gear multiplication and available Tq at your cruise rpm.

**If your truck was a 2.42 rear.... I'd say it's a super direct setup. No overdrive in the transmission.
** However, there is a adaptive gear package from Volvo for 2.47 rears with overdrive.... It just locks out the OD gear when you're heavy......When light # it cruises at something crazy like 1050@70mph.
Pretty crazy but the newest engines also make peak tq under 1000rpm.


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Nah you have to be turning 1800 and black coal rolling.......

C'Mon man they are going to pull you trucker card saying stuff like "Drive how the motor is designed"!

/sarcasm

 

Hahahaha right on

 

@Dadetrucking305 buy a truck with Cummins CM2350 engine. Listen to Dave_in_Az about DD15 issues. He is telling the truth. 619K is dangerous mile point. You may need 1 box, injectors and bunch of other #### to be replaced on the engine. I have it and I know it.

 

Flat deck at 80k+ means long wheelbase, smaller sleeper, higher ratios. Aero cabs usually aren't spec'd to handle the stress of all-80k all the time. Nor are they built to last like a Paccar, Starcar or Mack would be.

Longer wheelbase and smaller sleeper because you will likely be able to overhang the front of your trailer more and wanting to save weight for bigger payload (if you can't tare out closer to 30,000, you might miss out on some loads).

Higher ratios aren't necessary but they will help you get up bigger hills faster and the less time you spend on the hill, the less fuel you use to get up it. If all you do is run the Dakotas to Texas, you would gain benefit from a lower ratio, but once you go east of the Mississippi, the hills will kill your fuel economy.

Don't buy a van puller and expect it to do well in flat deck. Spend the little bit extra and find something built to pull a skateboard.