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Old 02-21-2007, 02:35 PM   #11
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Isn't the Gear Vendors unit only rated to something like 10,000 lbs GVWR? Even if it was rated for more...marrying it to any transmission other than the typical TH350, TH400, SM465, Muncie car trannies, etc would be a pain.
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Old 02-21-2007, 03:12 PM   #12
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They put Gear Vendors boxes in Class A motor homes.
For commercial service they say max 25.000 lbs, but I don't see a limit listed
for recreational use.

And they can be installed "free standing" with a drive shaft on each end.

But those things cost thousands.
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Old 02-21-2007, 03:21 PM   #13
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Ooooops...

Correction: Only 235 HP for AT545. It's the MT643 that can take 250 HP.

To recap:
AT545 -- 235 HP and 30.000 Lbs -- no lockup.
MT643 -- 250 HP and 73.280 Lbs -- locks in 3rd and 4th.
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Old 02-21-2007, 04:18 PM   #14
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Man... I'm still playing with crayons compared to you guys !!
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Old 02-21-2007, 04:39 PM   #15
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How so, Oldog? Ask questions -- somebody here will get you up to at least watercolors
in a hurry!

Everything takes learning. 18 months ago I didn't have a clue about buses either.
So I started reading on this and other web sites. Then I bought a $250,- bus and learned
a lot from toying with that and driving it on two "expeditions" (and then I scrapped it).
And I pick the shop foreman's brain at work. Everything takes learning.
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Old 02-21-2007, 06:23 PM   #16
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Good to know about the GV unit, Elliot. I had never heard of one being mounted in a divorced setup, but sure isn't tought to go from married to divorced mount. The other way is a bit trickier...

What is the maximum input torque on the AT545? The first Series 1000 Allisons in the GM pickups were rated at 520 ft lbs I believe and I would imagine our ratings are very similar. Interestingly enough, the Allisons in the Duramax trucks have lagged behind the engine output in terms of input torque max.

The reason I ask is because I plan to up my fuel rate come spring. I'm not interested in more top speed right away (though I will likely turn the governor up later on). I just want a little more power on reserve in drive on the highway. My engine most certainly runs out of fuel on the top end. From the factory my particular turbocharge and intercooled 6.6 Brazilian was rated at 185 hp and 474 ft lbs. It isn't a tremendous amount of power, but it is the H.O. version of the 6.6. It only makes 5 horsepower less than the bottom end 7.8 Brazilian. I'd like to bump the horsepower up into the 200-210 range (seat of the pants dyno, mind you), but I'm concerned what this will do to my torque. A 25 horsepower increase may well give a 50 ft lbs increase putting me dangerously close to AT545 shredding terrain.
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Old 02-21-2007, 07:48 PM   #17
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AT545 max input torque is 445 lb ft.
MT643 -- 640 lb ft.

No, I don't walk around remembering this stuff!
It's all right here: http://www.industrialautomatic.com/html/onhiway.htm
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Old 02-21-2007, 10:27 PM   #18
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Well...that makes me a little nervous given the fact that my 6.6 is rated at 474 ft lbs at the crank stock. I suppose there is some room in there given that the 474 is lower in the powerband and not really something it would be subjected to constantly. Do I need to be concerned about turning my pump up? What is the 6BT Cummins putting out for peak torque?
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Old 02-21-2007, 11:21 PM   #19
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Quote:
What is the 6BT Cummins putting out for peak torque?
I suppose I could look that up, but I don't need to -- I have the big tranny.
BWWWAH-HAH-HAH-HAH-HAH-HAH!

Oooo, this is fun!
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Old 02-21-2007, 11:32 PM   #20
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Well, I would love a tandam axle Crown bus with a 10-speed. That would be classic.
How expensive are the parts to put in a 4.10 rear end? Is it something a shade-tree mechanic can do?
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