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Old 02-06-2019, 03:47 PM   #1
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Allison 2000 ID

Iíve come across an Allison 2000 transmission from another bus. The junk yard only wants $700 for it (transmission with Ecu, but not the shifting buttons).

How do I find out if itís the 5 or 6th speed version?

My top speed of my current 545 w/t444e is 55 at 2500rpm. Trying to figure out what my new top speeds would be with a 5 and speed OD?

Is this a good deal?

Iím trying to decide if I should regear the bus or change the transmission.

Thoughts?

Thanks!IMG_4150.jpgIMG_4151.jpgIMG_4147.jpg
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Old 02-06-2019, 03:51 PM   #2
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Contact Allison. They can give you all the details from the serial number.
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Old 02-06-2019, 04:36 PM   #3
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Allison said itís a 5sp capable of 6sp.. trying to find out the final gear ratio... I think itís .74
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Old 02-06-2019, 04:44 PM   #4
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For 1000 & 2000 series the following are supposed be the ratios...


First: 3.10

Second: 1.81

Third: 1.41

Fourth: 1.00

Fifth: 0.71

Sixth: 0.61

Reverse: 4.49




However, I believe there are both wide & close ratio versions. Best to check with Allison. With the serial number they should be able to tell you exactly what you have.
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Old 02-06-2019, 04:49 PM   #5
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IIRC: 2005 and earlier are 5speed. 2006 and later are 6 speed.

The 6 speed transmissions in school buses typically have 6th gear disabled.

You can upgrade an earlier 5 speed to 6 speed by swapping out the valve body and reprogram the TCM.
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Old 02-06-2019, 05:27 PM   #6
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Quote:
Originally Posted by Tango View Post
For 1000 & 2000 series the following are supposed be the ratios...


First: 3.10

Second: 1.81

Third: 1.41

Fourth: 1.00

Fifth: 0.71

Sixth: 0.61

Reverse: 4.49




However, I believe there are both wide & close ratio versions. Best to check with Allison. With the serial number they should be able to tell you exactly what you have.
I know the od on a 5 speed 2000 series in a school bus is .74

Edit- you're close. Those ratios you listed are for a 1000. The 2000 series has ever-s0-slightly lower gearing.
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Old 02-06-2019, 05:51 PM   #7
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Allison 2000 ID

Right on. Thanks for the replies! Iím going to pull the trigger and get it in the morning. Seems like a really good deal, supposedly it came off a bus with the same engine T444e with less than 100k miles.

Since it came off a bus with the same engine and Iím getting the transmission ECM with it I wonder if itís going to be plug and play?
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Old 02-06-2019, 05:52 PM   #8
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Allison 2000 ID

.74 final gearing will take my top speed from 55 to 75mph, and my cruising speed from 44 to 60mph

Which I donít even see the point in trying to unlock 6th gear...
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Old 02-06-2019, 06:02 PM   #9
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Quote:
Originally Posted by Rogue1bus View Post
.74 final gearing will take my top speed from 55 to 75mph, and my cruising speed from 44 to 60mph

Which I donít even see the point in trying to unlock 6th gear...
The only reason I want 6th unlocked is for the fuel economy.
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Old 02-06-2019, 06:20 PM   #10
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Quote:
Originally Posted by Rogue1bus View Post
.74 final gearing will take my top speed from 55 to 75mph, and my cruising speed from 44 to 60mph

Which I donít even see the point in trying to unlock 6th gear...
OD is great but I think folks get a *little* too carried away with the whole "have to unlock 6th" thing. I get it, I love modifying stuff for more enjoyable use.
OD would be awesome!!!
This is probably THE best swap especially behind a 444E.
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