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Old 08-30-2019, 09:26 AM   #1
Mini-Skoolie
 
Join Date: May 2015
Location: Maine
Posts: 14
Year: 1998
Coachwork: Blu Bird
Chassis: GMC
Engine: Cat
Rated Cap: 72
Need help please

How do I find out exactly what transmission is in my bus?

It looks like I’ve narrowed it down to 3 options but I need to be 100%.

Thank you

1998 gmc blue bird cat engine 3126

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Old 08-30-2019, 09:28 AM   #2
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Location: Weeki Wachee, FL
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Year: 1997
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: Cummins 5.9
Rated Cap: 72
man y of them you can identify by the shift lever. Post a pic of it.
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Old 08-30-2019, 10:00 AM   #3
Mini-Skoolie
 
Join Date: May 2015
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Posts: 14
Year: 1998
Coachwork: Blu Bird
Chassis: GMC
Engine: Cat
Rated Cap: 72
Photo of shifter

Photo of shifter
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Old 08-30-2019, 10:20 AM   #4
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Chassis: TC2000 FE
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Rated Cap: 72
Looks like the ubiquitous AT545 to me, although I haven't seen a MT643 shifter which may be very similar
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Old 08-30-2019, 10:26 AM   #5
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Chassis: Freighliner FS65
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Quote:
Originally Posted by brokedown View Post
Looks like the ubiquitous AT545 to me, although I haven't seen a MT643 shifter which may be very similar
They're the same far as I can tell.
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Old 08-30-2019, 10:30 AM   #6
Mini-Skoolie
 
Join Date: Sep 2017
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Coachwork: Sheller globe Corp, superior division.
Chassis: 79 international
Engine: 345 v8
I was thinking the same Allison 545, my shift lever is the same except mine has a white button. Get underneath your bus on the passenger side and clean off any flat surfaces on that side of your tranny, there should be an ID plate with 545 on it.
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Old 08-30-2019, 04:11 PM   #7
Bus Nut
 
Join Date: Jul 2016
Location: Western Oregon
Posts: 876
Year: 1995
Coachwork: Blue-Bird
Chassis: TC RE 3408
Engine: 5.9 Cummins 12V Mechanical/Allison MT643
Rated Cap: Blue-Bird says 72 pass.
It looks just like mine too, with the one exception that on mine the R-N-D-3-2-1 are all the same color, which is a pale yellow. I don't know for sure what mine is but I was told it had the locking torque converter, and I believe I heard it locking or unlocking a couple of times when I was coming over here from the I 5 corridor after I picked it up. That highway mostly follows rivers, but there are a couple of good hills in between.
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Old 08-30-2019, 09:23 PM   #8
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Location: Huntington Beach CA.
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Year: 1991
Coachwork: Bluebird
Chassis: T/C 2000 28 foot Handy Bus
Engine: Cummins 5.9 Mechanical
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Quote:
Originally Posted by gs1949 View Post
It looks just like mine too, with the one exception that on mine the R-N-D-3-2-1 are all the same color, which is a pale yellow. I don't know for sure what mine is but I was told it had the locking torque converter, and I believe I heard it locking or unlocking a couple of times when I was coming over here from the I 5 corridor after I picked it up. That highway mostly follows rivers, but there are a couple of good hills in between.
OK the first picture is my original left side moved to the right side AT 545 Shifter. Pictures 2 and 3 are what came up in an image search for "MT 643 shifter.". I am going to guess AT 545
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Old 08-30-2019, 11:14 PM   #9
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https://tatumskoolie.wordpress.com/2...allison-mt643/

Here’s a swap job that shows them
Side by side
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