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Old 08-21-2014, 10:21 PM   #41
mtg
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Re: want just a bit more speed

Thanks for the replies. I did some initial research, and yeah, the ZF6 seems like an initial candidate.

As far as torque/power ratings, I haven't done all of my research yet, but the T444 is detuned compared to the Power stroke, so that's in my favor for longevity.

We'll see. With the trans cooler that I just installed, at least I can go up the hills now without over heating, but only at 30 mph, and dumping probably 10-20 HP into heat that I'd rather put into moving this behemoth up hills.

Reference numbers: I'm in my bus right now driving cross country through mountains. It's averaged about 10.5 mpg from Colorado to Washington so far (via Scan Guage).
We stopped at a weigh station, and it was 14,900 lbs loaded full.
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Old 09-05-2014, 12:40 AM   #42
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Location: Columbus, Indiana
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Year: 1991
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Engine: DTA 360, Fuller 6-speed
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Re: want just a bit more speed

Just looked up the IH 3600--really cool bus.

It's also great that you are using scangauge--I have that in my Powerstroke van.

I don't know what fixes are available for Ford trannies. On a Chevy TH700R4, the converter lock-up is electric. You can install a switch to lock the converter up with manually. If you could use an auto trans from a light-duty truck that had an electric converter lock-up, that could be an option.

The u-joints, which I mentioned earlier, on a medium-duty truck are comically big compared to pick-up truck stuff. My Powerstroke van, in fact, has a Dana 60 rear axle. It's a full floater, but it has a tiny 9-3/4" ring gear compared to a 15-18" ring on a bus. The parts are small under there because it's in a vehicle with relatively low mass. If you install a pick-up truck tranny, it will be ridiculous looking and will give you cause for pause. Why are the medium-duty parts so big?

I have another pick-up with a Gear Vendors in it. Gear Vendors claims their unit is rated for 30,000# truck and trailer. I'm willing to bet that if I put it in my 20,000 bus somehow, they wouldn't honor the warranty. I've had it for 10 years, and pulled a 3-axle gooseneck with it for much of that, but looking under a pickup truck and looking under a bus--they are very different in scale.
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Old 09-05-2014, 05:09 PM   #43
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Re: want just a bit more speed

Are you wanting an auto trans? Or are you looking for a manual? Either way, I'd start another thread with all your specifics on it and a few pictures just so it's easier to navigate and find.
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Old 09-09-2014, 01:00 AM   #44
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Re: want just a bit more speed

Quote:
Originally Posted by mtg
Thanks for the replies. I did some initial research, and yeah, the ZF6 seems like an initial candidate.

As far as torque/power ratings, I haven't done all of my research yet, but the T444 is detuned compared to the Power stroke, so that's in my favor for longevity.

We'll see. With the trans cooler that I just installed, at least I can go up the hills now without over heating, but only at 30 mph, and dumping probably 10-20 HP into heat that I'd rather put into moving this behemoth up hills.

Reference numbers: I'm in my bus right now driving cross country through mountains. It's averaged about 10.5 mpg from Colorado to Washington so far (via Scan Guage).
We stopped at a weigh station, and it was 14,900 lbs loaded full.
That auto is slaying your fuel economy. With a small bus like yours, you would get 14mpg with a manual or a lock-up. I get 12.5 with a 20,000# full load--and we have stuff on the roof as well.
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Old 11-07-2014, 01:13 PM   #45
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Re: want just a bit more speed

Looks like some of this thread has been truncated....

I have a 2002 DT466E Navistar / International that is speed limited to 55mph. The speed limit in the UK is 70mph. The bus is now in the UK with no International dealers.

It looks like there is an ECU that is doing the speed limit rather than a physical limiter (I believe the speed limit in the USA is 55mph)

How do I remove the speed limit?

Do I have to reflash a ROM somewhere? (can you buy the software and connectors to reflash oneself?)

Is it possible to buy a replacement ROM?
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Old 11-07-2014, 02:08 PM   #46
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Re: want just a bit more speed

To go from 55 to 70 is a lot of rpm increase. You need the gearing to allow going that fast, along with the computer program to let it hit 70+.
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Old 11-13-2014, 09:49 PM   #47
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Re: want just a bit more speed

Will,
I read through your gear change, 4.88 to 3.73's. I was wondering what size tires do you have on your bus?
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Old 03-13-2015, 12:03 AM   #48
mtg
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Got just a little more speed....

I put off the trans swap that I was looking into earlier. However, I noticed that besides the rear axle being sprung for 5,000 lbs over GVWR, the rear of the bus sat noticeably higher than the front, which effectively increased the frontal area with regards to aero drag.

In a two birds/one stone project, we restacked the rear leaves/spacers to soften/lower it, as well as removed a couple unneeded appendages that were sticking out in the wind. The rear sits lower, with the roof being pretty much parallel to the ground now.

The net improvement is that the rear suspension actually moves now, and the bus gets at least the same mpg, but at about 2-3 mph faster now.

So, there ya go. If you can make any easy drag reductions, go for it.
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