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04-12-2016, 10:21 AM
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#1
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New Member
Join Date: Apr 2016
Posts: 8
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Chevy 454 to Allison three speed Automatic
I have a 1984 International Thomas built school bus, with a 345 international engine that I blew up. I have not been able to find a good 345 for any price that I am willing to pay. Does anyone know a part number or name of an adapter from a Big Block 454 Chevrolet to the Allison three speed Automatic transmission? Not sure of the transmission model.
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04-12-2016, 10:27 AM
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#2
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New Member
Join Date: Apr 2016
Posts: 8
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454 chevy to Allison Transmission adapter
Anyone know what adapter to use when going from a 454 big block chevy to a 1984 Allison Three speed Auto transmission? (not sure of the trans model)
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04-12-2016, 10:32 AM
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#3
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Moderator
Join Date: Feb 2007
Location: NUNYA
Posts: 4,236
Year: 1995
Coachwork: Thomas
Chassis: 3800
Engine: DT408, AT545
Rated Cap: 23 500 gvw
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Please don't post the same question in multiple sections.
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04-12-2016, 10:36 AM
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#4
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Bus Geek
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
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Hmmm...the only Allison 3 speed auto I know of is the old V730 series which goes back quite a ways to the old GM "Fishbowl" bus days.
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04-12-2016, 10:51 AM
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#5
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New Member
Join Date: Apr 2016
Posts: 8
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Maybe it is a 4 speed. I cant find any info on a three speed. Ok how about 454 chevy to AT545?
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04-12-2016, 10:54 AM
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#6
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Almost There
Join Date: Apr 2016
Location: on the land of tejas; state of mind
Posts: 86
Year: 95
Coachwork: Amtran ss-33
Chassis: Int 3800
Engine: dt444E
Rated Cap: 29,000
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look in old truck junkyards for an 454 to sae bell housing, i assume the trans is a 545 industrial model. should be a lot of those in 24' box trucks from the late 80's before the 366 gasser and 8.1 gasser engines were popular.
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04-12-2016, 11:06 AM
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#7
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Bus Geek
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
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545's are four-speed trannies.
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04-12-2016, 11:18 AM
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#8
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Bus Geek
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
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Personally, if I were going to the trouble of swapping out the trans...I would not waste my money or time on either a 730 series or a 545. Both are dinosaurs and only rarely had special order lockup. Start by determining what SAE pattern you have on your engine...then look for a newer 4, 5 or 6 speed trans that matches. Preferably one with full lockup and possibly overdrive. If that gets complicated...then you can always start looking at adapter plates. As I recall, the majority of Allisons come as SAE #3 but there are other variants as well.
I have an SAE #3 Allison AT 545 sitting in my shop that even has a factory driveline park brake on it. You can have for free. Just come get it. They are so outdated they are hard to give away these days.
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04-12-2016, 11:47 AM
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#9
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Bus Geek
Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
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Have you looked on fleabay lately. 545s seem to be selling pretty well.
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04-12-2016, 11:56 AM
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#10
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New Member
Join Date: Apr 2016
Posts: 8
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Tango, Where are you located? I would at least like to come look at it, and talk to someone that knows more than me about these things. Not swapping the tranny, but the motor from 345 International to 454 Chevy.
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04-12-2016, 01:20 PM
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#11
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New Member
Join Date: Apr 2016
Posts: 8
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I have looked on Ebay, but when I look at the SAE #3 it just does not look right.
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04-12-2016, 03:11 PM
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#12
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Bus Geek
Join Date: May 2014
Location: West Ohio
Posts: 3,674
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
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I'm confused here. Are you looking for an engine or trans?
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04-12-2016, 03:44 PM
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#13
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New Member
Join Date: Apr 2016
Posts: 8
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Looking for the adapter for 454 chevy to Allison AT545 trans
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04-12-2016, 04:03 PM
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#14
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,753
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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04-12-2016, 04:16 PM
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#15
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Bus Geek
Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
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A 454 for a 545? You'll never have confusion issues on that subject.
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04-12-2016, 04:34 PM
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#16
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Bus Geek
Join Date: May 2014
Location: West Ohio
Posts: 3,674
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
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Kid's got what you need right there.
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04-12-2016, 09:49 PM
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#17
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Bus Geek
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
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I'm in Houston , TX. I've not run the trans but it was attached to the excellent 4BT I bought and listed as "totally operational". Be happy to see it find a home. I hate scrapping anything that is even remotely functional.
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04-13-2016, 07:42 AM
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#18
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New Member
Join Date: Apr 2016
Posts: 8
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Cadillackid you are the man. That is just what I needed. Thank you for the help. Purchased and on the way.
Thanks again to everyone.
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