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Old 08-30-2019, 10:26 AM   #1
Mini-Skoolie
 
Join Date: May 2015
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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 Iíve 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, 10:28 AM   #2
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man y of them you can identify by the shift lever. Post a pic of it.
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Old 08-30-2019, 11:00 AM   #3
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Rated Cap: 72
Photo of shifter

Photo of shifter
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File Type: jpg 541C1FAA-0D72-415F-9081-BB2320E36B0A.jpg (171.1 KB, 12 views)
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Old 08-30-2019, 11:20 AM   #4
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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, 11:26 AM   #5
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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, 11:30 AM   #6
Mini-Skoolie
 
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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, 05:11 PM   #7
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Engine: 5.9 Cummins 12V Mechanical/Allison MT643
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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, 10:23 PM   #8
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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 08-31-2019, 12:14 AM   #9
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https://tatumskoolie.wordpress.com/2...allison-mt643/

Hereís a swap job that shows them
Side by side
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