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Old 12-29-2015, 10:58 AM   #31
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I do plan on taking it cross country. My dog, my girlfriend and I are planning on living out of it and traveling the west side of the country. Maybe Canada as well. We would like to live out of the bus for a few years doing this if we can make it work. I will be doing a pretty basic renovation as we will hopefully be able to do a lot of camping in the woods. Wood burning stove is the only real requirement I have other than a solid bus that can handle some mountain driving
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Old 03-06-2016, 01:45 PM   #32
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Quote:
Originally Posted by Elliot Naess View Post

This is quoted from the first message in this thread, which is several years old by now. I just wanted to document that the referenced link is no good any more. It's Chinese or Japenese text now, and Google translates a bit of it like this:

"Is it true that there is an annual income limit for caching? Law of the mechanism and correct debit, how to return. Caching of record let you know exactly how the future, where the influence. Caching even in part-time job is OK? Let us in the perfect preparation and mental attitude. There is the obligation to return the debt of her husband? Do you have responsibility for a debt of the secret to his wife "

Strange, and not a lot of useful.
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Old 03-06-2016, 02:07 PM   #33
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Quote:
Originally Posted by dan-fox View Post
This is quoted from the first message in this thread, which is several years old by now. I just wanted to document that the referenced link is no good any more. It's Chinese or Japenese text now, and Google translates a bit of it like this:

"Is it true that there is an annual income limit for caching? Law of the mechanism and correct debit, how to return. Caching of record let you know exactly how the future, where the influence. Caching even in part-time job is OK? Let us in the perfect preparation and mental attitude. There is the obligation to return the debt of her husband? Do you have responsibility for a debt of the secret to his wife "

Strange, and not a lot of useful.
That's what happens when people don't pay their bills.
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Old 03-31-2016, 02:48 AM   #34
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It's the nature of the interweb. Websites come and go. Right now I got just "error 403" on that link. But I find that practically any information can be found with a bit of searching.

And the MD3060 seems to be the "standard" transmission these days, yes. It is a six speed, but I read that 6th gear is often blocked in school buses. These days, that would be controlled by a computer, and you would probably need to spend a few hundred at an Allison dealer to get 6th gear activated again.
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Old 05-25-2016, 07:20 PM   #35
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I know it's not quite the same but I've got a Allison 647, what can anybody tell me about this Trans? If anything.

: Thanx:
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Old 05-25-2016, 07:51 PM   #36
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Originally Posted by Stu & Filo. T View Post
I know it's not quite the same but I've got a Allison 647, what can anybody tell me about this Trans? If anything.

: Thanx:
Ok did find some info that stated their rated for up to 350hp.
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Old 05-25-2016, 10:08 PM   #37
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I've found that tranny available used out of wrecked motor homes, but they didn't list a price. I was looking at pictures, you didn't say I had to read. Numbers, you know how bad at math I am.
This is going to take all day. What do you know about it? You bought one.
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Old 05-25-2016, 11:26 PM   #38
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Google is your friend. From just a couple minutes (I'm kind'a busy) it looks like the 647 is a beefed up version of the 643.

And look what else I found. This was posted by somebody on a forum, so the source is not certain, but it has the look of legit information copied out of a publication.


"Here are the complete Allison MT (since 1973) series transmission specifications, for those of you who are concerned about power and whether or not your transmission's good enough for your engine.

MT-640/643/650/653DR
Input speed: 2,200-4,000 rpm
Max input power: 250 hp (186 kW) (general purpose); 210 hp (157 kW) (transit/shuttle bus)
Max input torque: 640 lb/ft (868 N-m) (general purpose); 590 lb/ft (800 N-m) (transit/shuttle bus)
(1)3.58(2)2.09(3)1.39(4)1.00(R)5.67
Torque converter ratios: TC-380 (1.86:1), TC-370 (2.43:1) and TC-350 (3.09:1)

MT-644/654CR
Input speed: 1,800-3,000 rpmallison transmission mt653
Max input power: 300 hp (224 kW) (general purpose); 250 hp (186 kW) (transit/shuttle bus)
Max input torque: 780 lb/ft (1,058 N-m) (general purpose); 690 lb/ft (936 N-m) (transit/shuttle bus)
(1)3.58(2)2.09(3)1.39(4)1.00(R)5.67
Torque converter ratios: TC-494 (1.92:1), TC-495 (2.21:1) and TC-497 (2.70:1)

MT-647/648
Input speed: 1,800-2,600 rpm
Max input power: 300 hp (224 kW) (general purpose); 250 hp (186 kW) (transit/shuttle bus)
Max input torque: 950 lb/ft (1,288 N-m) (general purpose); 800 lb/ft (1,085 N-m) (transit/shuttle bus)
(1)3.58(2)2.09(3)1.39(4)1.00(R)5.67
Torque converter ratios: TC-494 (1.92:1) and TC-495 (2.21:1)



AT 545
(1)3.45(2)2.25(3)1.41(4)1.00(R)5.03
2400rpm-4000rpm
27.2 inches long 267lbs

235 HP 445 LB-FT"
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Old 11-05-2016, 02:02 AM   #39
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So when you see "Automatic Transmission" on an auction site, what do you do? I would want to call someone and ask which transmission they have. Seems the shop would know off the top of their heads. Is this the way to handle it?
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Old 11-05-2016, 03:08 AM   #40
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Trouble is, they won't know. Nobody there will know. The model of the automatic transmission is not relevant to anything in daily use, and the transmission itself is completely out of sight.

If you are lucky, a mechanic who has worked on it may -- may -- know, but this is far from certain.

When I bought Millicent, a mechanic at the school bus yard told me she had an AT545. After I arrived home, I discovered to my delight she has an MT643.

That said....

A newer bus may have a 5-speed or even 6-speed. (The 5-speed is a 6-speed with 6th gear blocked out, to limit top speed, because 6th is a long-legged overdrive ratio.) If -- IF -- the shift selector shows 5 forward positions, then you are safe from the AT545. But I have never seen any of those gear levers. For all I know, it may have just "D". After all, school buses are made for housewives to drive.

So... exactly what do you do?

Study the weight of the bus. That is, the Gross Vehicle Weight Rating.
Look at the beginning of this thread, and you will see how much weight the AT545 is approved for by the manufacturer. A 40 foot bus is probably rated for a couple thousand pounds more.

Usually, they post a photo of the factory plate that shows the weight ratings. But it is a good idea to learn to judge the length of a bus by the number of windows -- not counting the driver's window (or the door on the other side). One window = one seat. Mind... there are variations for emergency doors, wheelchair lifts and rear-mounted engines.

Also, the listing may give the number of passengers. In school buses, they count three kids to each seat. So... 6 kids x 14 rows = 84 kids = 40 feet = probably too heavy for an AT545.
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