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Old 06-02-2016, 12:47 PM   #51
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I've researched the MD3060 extensively so feel free to let me know what you'd like to know.
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Old 06-02-2016, 01:08 PM   #52
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I've talked to Allison here in the past few minutes. Seems to be up in the air whether the 2nd overdrive is available or optioned out. Either way, it seems the 5th gear is an overdrive gear, not 1:1, like apparently some bus transmissions have. The rear end ratio is still only a factor based upon your transmission gearing, so I just wanted to be clear where we are here.

So, knowing the tire size, rear diff and 5th, I'm calculating speeds/rpms as we speak here.
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Old 06-02-2016, 01:32 PM   #53
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So, the tire size on the bus is 295/75R22.5, a 40" overall diameter tire
The MD3060 5th gear shows it at .75:1
My bus has a 5.63 rear axle ratio
So speed/rpm is:

55mph 1950 rpm
60mph 2128 rpm
63-64mph 2250 rpm, limit of the 3126 CAT 250hp engine

IF 6th can be unlocked (or isn't locked at all):

55mph 1691 rpm
60mph 1844 rpm
65mph 1998 rpm
70mph 2152 rpm
73mph Limiter


Dooable I think. I've searched to see if Allison will unlock the 6th, and have gotten mixed responses and experiences. The Allison guy on the phone said they would, but...who knows.

Point is, rear axle ratio doesn't say it all if you don't know the transmission type/gearing.
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Old 06-07-2016, 11:45 PM   #54
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Stopped in Louisville on a trip I'd made this past weekend. I decided to look at the bus in person and then leave a deposit. Bus looked very clean inside and out, I felt pretty good about it.

128k on the odometer

Hrs on the tach

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Old 06-07-2016, 11:53 PM   #55
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Nice!


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Old 06-08-2016, 06:14 AM   #56
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in my experience you'll fid that driving a school bus over 65 isnt always as easy or comfortable as it seems... esp if you are in traffic, hills, wind, etc... your bus may be heavy enough and have enough power that unlocked 70 MPH would be perfectly fine.. but many busses ive driven after 65 they can get a bit squirly...

-Christopher
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Old 06-08-2016, 08:48 AM   #57
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One of the issues in the bus driving learning curve that many people don't take into account until it scares the beejeezus out of them is crosswinds. Whether natural or from a line of tractor trailers. Most buses are built like a pair of billboards and it really doesn't take that much moving air to start seriously pushing them around. You have to keep up with crosswind conditions or you can find yourself either in a ditch or headed into oncoming traffic.

Be careful out there.
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Old 06-08-2016, 09:34 AM   #58
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the other piece is driving a flat-nose bus... the steering reaction-perception often gets a lot of people with the bus swaying... or people try to correct every little movement the bus makes within a lane...

when a tractor trailer passes you.. its tendency is to suck the bus in.. when the trailer passes the tendency is to blow the bus away... you may have to correct a little if the windows are just right... otherwise I tend to let the bus suck in a little knowing it will blow right back when the trailer passes...

the bigger the tires you have typically the more steering input you perceive to need because the reaction is not instant... the tire actually flexes a bit and the gyroscoping of a spinning round object makes you think you moved the wheel and nothing happened.. then the tire "catches up" in direction to the rim and the bus changes direction...

many car-drivers criticize semi trucks for seemingly "moving around within their lane".. when in actuality its a relaxed driver not stressing over little movements.. knowing how their truck reacts...

its all a learning experience and driving the bus is the best way to get used to it...

the faster you go the more gyroscoping effect of the tires and more effects of wind...

I like to run fast enough to be safe in traffic but not so fast that its no longer fun to drive..

in the hills its perfectly acceptable to drive nice N slow if that makes you feel more comfortable behind the wheel.. hills / mountains often bring some fierce winds...

-Christopher
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Old 06-08-2016, 09:46 AM   #59
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Interestingly, this past trip I took was in my large box truck. As stated prior, I simply don't drive the box truck over 60 as is. 60 is a comfortable highway speed that many semi's run at, and frankly you're not always doing lane changes to pass either, which makes the drive easier. The difference between 60 and 65 mph, across the country adds up to small advantages in time, so if you're making money for your mileage so be it. For recreational purposes though, I don't see the need whatsoever. In my case, while my box truck is monetized, I drive slower because my trucks brakes just aren't fantastic, and the gas mileage is better at a slower speed.

For me, unlocking or having 6th is more about running 60 at 1850rpm vs running 70mph down the road. I want the gear for reduced wear and gas mileage.

On the high profile, blowing around deal, that's definitely a fact I got familiar with in my class a that I had. I went from PGH to Las Vegas for SEMA and decided to take my motorhome. I was approaching toward Vegas from the south and nearing the area of the Hoover Dam. The winds were very gusty and it was moving anything with large profiles all over the place. Here, as I turn the corner and approach this bridge, a sign says "High profile vehicles use the center lane to cross bridge"...something along those lines, then a flashing sign saying "High Crosswinds"...I was like...awww hell...lol. It was interesting I tell you that....but yeah, you have to learn to get comfortable letting them move around a bit beneath you, instead of fighting every twitch.

My old whore here:



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Old 06-08-2016, 10:15 AM   #60
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I uploaded my snapchat vid I sent to a few people. I'm in the end...sorry. I got an old 240Z that I'm restoring and had to pick up the body. Officially the third car I've transported in my box truck...lol.

Here's a quick vid of the bus

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