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Old 03-21-2010, 02:05 AM   #1
Mini-Skoolie
 
Join Date: Jan 2010
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Year: 2001
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Allison Transmission ID

Weirdly, I haven't been able to find any resources online that can tell me how to simply tell exactly which tranny I've got-
SN location? Bolt patterns? etc-

I've got a couple- one a 4spd behind a International T444E and the other a pushbutton 5spd in front of a JD 8.1 (pusher)- any help would be appreciated, I need to understand torque figures but at this point I don't even know which exact transmissions I'm dealing with
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Old 03-21-2010, 10:00 PM   #2
Mini-Skoolie
 
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Re: Allison Transmission ID

Answering my own question- I found this thread:

viewtopic.php?f=6&t=1824

(which I didn't see before because it's in the "Everything Else" section)
It appears that I have an MT643 in the Carpenter/International and something more exotic in the Bluebird pusher (It looks much beefier even, which probably makes sense given that the engine does 640 ft/lbs in its base trim)
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Old 04-10-2010, 05:52 PM   #3
Mini-Skoolie
 
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Re: Allison Transmission ID

Replying to my own thread again- actually I've got an HT series, as described in this Allison ID/User Manual:

http://www.allisontransmission.com/publ ... 1334EN.jsp
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Old 04-10-2010, 09:11 PM   #4
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Re: Allison Transmission ID


I don't know if this is official, but AT probably stands for Automatic Truck, MT for Medium Truck, and HT for Heavy Truck.

These correspond with the 500-series, the 600-series and the 700-series.

If you have an HT-700-series tranny in your Blue Bird, then your engine puts out more than 250 HP and/or 640 Pound/Feet. In other words, you have one hecka bus!
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