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Old 08-09-2016, 09:14 AM   #1
Bus Nut
 
Join Date: Jun 2011
Location: KANSAS CITY
Posts: 452
Allison 2000 transmission? Is it a MT643?

Looking at: 2002 IH 71 pass school bus T444 diesel motor Allison trans,

The man says it has a 2000 transmission and it is not a 545.

1000-2000 Series

Allison Transmissionís 1000 and 2000 Series are rated up to a maximum of 224 kW (300 hp) and have up to six speeds available, including two overdrives. Both close and wide ratio gearing are offered. The addition of 5th Generation advanced electronic controls enhances operation and prognostics capability

Thanks in advance.

OOPS! I should have searched a bit more.


The Allison transmission series 1000, 2000 & 3000 are 5/6 speed automatics with overdrive. The differences of interest to skoolies are horsepower & torque limits. If it came in the bus with the engine, it's fine. These are generally the preferred automatics installed in school buses in the last 25 years.
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Former owner of a 1969 F600 Skoolie.

1998 Ford B700 Thomas body 65 passenger. 5.9 Cummins 12 valve with MT643 Transmission 123,000 miles.
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Old 08-09-2016, 10:28 AM   #2
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 6,038
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
the 2000 series is a nice transmission, its still run in many of the newest busses. in most cases it will be limited to 5 speed, however allison can unl;ock the 6th gear if you need a taller over-drive gear...

-Christopher
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Old 08-09-2016, 04:37 PM   #3
Bus Nut
 
Join Date: Aug 2014
Location: MD near DC
Posts: 591
Quote:
Originally Posted by cadillackid View Post
the 2000 series is a nice transmission, its still run in many of the newest busses. in most cases it will be limited to 5 speed, however allison can unl;ock the 6th gear if you need a taller over-drive gear...

-Christopher
Oh! I thought that whole freebie-sixth-gear thing was limited to the 3060. Is it available in any 2000-3000 series?
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Old 08-09-2016, 06:34 PM   #4
Bus Nut
 
Join Date: Jun 2016
Location: Garden State (rural NJ)
Posts: 383
Having 6th gear unlocked seems to only be successful with REs. Allison claims they're concerned about the drivetrain durability/speeds on the FEs. I believe that all the REs use 3060s. I may be wrong about that, however.
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Old 08-09-2016, 10:39 PM   #5
Bus Nut
 
Join Date: Jun 2015
Location: Wisconsin
Posts: 266
Our buses all have the Allison 2000 series transmissions.

They're pretty great. We have Bluebird FE buses so the 6th gear is locked out. We can hit 74 mph on the Interstate once you're in 5th.

They are great units and I wouldn't hesitate to buy one for skoolie purposes.
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Old 08-10-2016, 07:44 AM   #6
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 6,038
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
I was told by my international dealer here in town that he could get allison to open 6th gear on any International-chassis bus.. im not sure if the newer bluebirds and Thomas's count?

at the time I was looking at a newer IC CE-200 (2009). with an allison 2100 in it and a Maxxforce DT (DT-466E?).. and if i wanted to Lease or Buy a brand new bus he could get it shipped to me with 6th gear open...

allison will see a bare transmission with 6th open. a couple on this forum have gotten them for their custom projects this way..

as many have stated running a diesel at low RPM's is preferred over "maxxing it out" .. openbing 6th wont stress the dirvetrain any-more as the trans should just drop into a lower geasr when you run the bus up a hill.. but will practically idle down the road on flat ground...

-Christopher
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