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Old 01-13-2018, 09:32 AM   #1
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Allison 2000 Tranny

What do we know about the Allison 2000 behind a Cummins 5.9?
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Old 01-13-2018, 09:47 AM   #2
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sounds like a winner to me.

later J
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Old 01-13-2018, 10:01 AM   #3
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sounds like a winner to me.

later J
Well that reply was certainly insightful.
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Old 01-13-2018, 10:05 AM   #4
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well , what do you want to know, do a google search, allison 2000 world class transmission 5 / 6 speed with lock up ,, what do you want that there is 2 lbs of gold inside?

later j
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Old 01-13-2018, 10:19 AM   #5
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It's all here:

1000-2000 Series
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Old 01-13-2018, 10:29 AM   #6
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well , what do you want to know, do a google search, allison 2000 world class transmission 5 / 6 speed with lock up ,, what do you want that there is 2 lbs of gold inside?

later j
See, now this is much more helpful. It tells me with a possible 6th gear it would put less strain on the 5.9, making a more suitable option for my needs. I value the experience on this board. That's why I know the 545 is the least desirable. Yes, some do okay with a 545, but general consensus is it ain't the cats meow. I can google search (Thank You Twigg), but it doesn't really give me real world experience like what I get here. And 2lbs of gold in one would be a nice option.
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Old 01-13-2018, 10:31 AM   #7
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See, now this is much more helpful. It tells me with a possible 6th gear it would put less strain on the 5.9, making a more suitable option for my needs. I value the experience on this board. That's why I know the 545 is the least desirable. Yes, some do okay with a 545, but general consensus is it ain't the cats meow. I can google search (Thank You Twigg), but it doesn't really give me real world experience like what I get here. And 2lbs of gold in one would be a nice option.
It didn't help much.

"Possible" 6th gear might prove problematic.

6th gear would put more strain on the engine, not less, so you'd have to find out if the 5.9 can cope.
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Old 01-13-2018, 10:36 AM   #8
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Most allison 2000's you will find used will be 5 speeds with an .75 overdrive 5th gear, being an electronic transmission, you also need the TCU and a wiring harness that does not come with an at545 since it is mechanical. I am in the process of this swap behind a TE444 and getting the wiring harness made is costing more than the transmission and TCU did
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Old 01-13-2018, 10:38 AM   #9
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It didn't help much.

"Possible" 6th gear might prove problematic.

6th gear would put more strain on the engine, not less, so you'd have to find out if the 5.9 can cope.
Problematic how, unlocking that gear? Would not the 6th gear reduce RPM on the motor, thus relieving strain?
The bus in question has an oil leak, so I'm less interested in buying something that needs engine work right up front.
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Old 01-13-2018, 10:54 AM   #10
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Problematic how, unlocking that gear? Would not the 6th gear reduce RPM on the motor, thus relieving strain?
The bus in question has an oil leak, so I'm less interested in buying something that needs engine work right up front.
Within the spec, revs don't hurt the engine. 6th gear on the 2000 is 0.61 which is a very high gear.

Pulling that gear is more stressful than pulling 5th gear, 0.71.

Yes it reduces revs and maybe reduces fuel usage a little, but it is harder to turn which is why the highway buses generally have the bigger engines.

This is also why route buses have lower geared (higher numbered) final drives. They need that so the smaller engines can pull the heavy loads at lower speeds and highway performance is sacrificed.

If you want a reliable unit that can pull those higher gears on the highway, a bigger engine is more suitable.

So I'm not saying that there is anything wrong with the 5.9, but I am saying that it has a harder time pulling 6th gear than would an 8.3, or 7.6.
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