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Old 01-05-2017, 02:49 PM   #11
Bus Nut
 
Join Date: May 2014
Location: West Ohio
Posts: 566
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
If you have a full size bus similar to the one shown by Double07 you'll likely have the at545. If its a van built on the one ton chassis it should be the th400.
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Old 01-05-2017, 03:12 PM   #12
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Join Date: Jul 2011
Location: Winlcok, WA
Posts: 1,504
If you have a medium duty chassis you do NOT have a 6.0L engine although it may displace that much.

In the medium duty truck line at the time your bus was built the engine was known as the 366 Tonawanda big block V-8. It has nothing in common with the 6.0L that came out in about model year 2000 in the light duty line.

If you have a medium duty bus with an automatic it will most likely have the Allison AT540 series transmission. It should have four forward gears. Although, unless you really are in tune with your bus, you may not feel every gear change.
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Old 01-05-2017, 06:55 PM   #13
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 6,016
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
my original 86 bluebird was like this and had a '454HD' (whatever HD was?) and had an AT545 trans.. on that gasser is was EASY to tell the gear changes, the 545 whistle shifts were more pronounced than they are even in DEV and I hear them in that over the diesel engine.. if its a 545 you'll know it..

-Christopher
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Old 01-05-2017, 10:17 PM   #14
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Join Date: Dec 2016
Posts: 3
A 366 chevy tall deck big block is a 6.0 it says so right on the block. Its big brother is the 7.0 427. They are a completely different engine than the newer 6.0 small block. My Allison 545 has very large hydraulic lines compared to the small lines seen on the th350 400 transmissions. If I remember correctly, the Allison has a seperate bell housing from the trans body, the turbo hydomatics are one piece housings. Now that i am thinking about it, not sure if it is a seperate bell housing, but there is an adapter to bolt it up to the gm style block. I would go out and check, but it is cold and dark out there.

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Old 01-06-2017, 11:22 AM   #15
Bus Nut
 
Join Date: May 2014
Location: West Ohio
Posts: 566
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Cowlitz is talking about engine names. As everyone is aware of by now 366 cu.in. roughly equals 6.0 liters. The 366 is a completely different engine then the 6.0 LS based small block that came out in the 90's.

However, in order to avoid confusion when talking about chevrolet engines, most people will refer to the 366 as the 366 and the 6.0 small block as the 6.0 regardless of what kind of tag is affixed to the engine.

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