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03-20-2015, 08:49 PM
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#1
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Bus Crazy
Join Date: Feb 2015
Location: Cincinnati, Ohio
Posts: 1,001
Year: 2000
Coachwork: Blue Bird
Chassis: International
Engine: TE 444
Rated Cap: 12
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at545 to mt643 swap on dt466
has anyone done this swap and what do you have to change if you have?
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03-21-2015, 08:40 AM
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#2
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Bus Geek
Join Date: Aug 2011
Location: Stony Plain Alberta Canada
Posts: 2,937
Year: 1992
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: 190hp 5.9 Cummins
Rated Cap: 72
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Quote:
Originally Posted by Kubla
has anyone done this swap and what do you have to change if you have?
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I'm going to have to swap my At545 out.
But I'm going to swap it for a Cummins 8.3 and md 3060 combo.
I will find a 8.3 with a 3060 already behind it.
Nat
__________________
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization
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03-21-2015, 10:55 AM
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#3
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Mini-Skoolie
Join Date: Jun 2014
Posts: 17
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I think you're a bit ahead of me in this swap, but from what I've found, you're likely going to need to swap/remove/add an adapter between engine and trans as the two trans have different bolt patterns. And, I believe you have to adjust drive shaft length/connection as well as trans mount.
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03-21-2015, 06:46 PM
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#4
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Bus Crazy
Join Date: Feb 2015
Location: Cincinnati, Ohio
Posts: 1,001
Year: 2000
Coachwork: Blue Bird
Chassis: International
Engine: TE 444
Rated Cap: 12
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if you accidentally roll your MT643 on it's side while trying to get it off the trailer, it will spill an incredible amount of tranny fluid on your driveway LOL
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03-21-2015, 11:54 PM
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#5
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Mini-Skoolie
Join Date: Jun 2014
Posts: 17
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Ha ha, woops.
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03-22-2015, 12:44 AM
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#6
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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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Only about 4 1/2 gallons.
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03-22-2015, 01:56 PM
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#7
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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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You'll have to look at your current flywheel housing to see what you'll need. On my bus, it has an sae2 flywheel housing necked down to an sae3 adapter that mates to the transmission. You'll also have to see if your current flexplate will work with the new converter. I bet it would but you might need spacers changed to get it to sit at the right depth. After that, the transmission should bolt right up. As said previously, you'll have to check driveshaft length.
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03-22-2015, 06:33 PM
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#8
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Bus Crazy
Join Date: Feb 2015
Location: Cincinnati, Ohio
Posts: 1,001
Year: 2000
Coachwork: Blue Bird
Chassis: International
Engine: TE 444
Rated Cap: 12
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I think I have bought the sae 3 to sae 2 adapter and it is being shipped, if not I just wasted 60 dollars
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03-22-2015, 07:54 PM
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#9
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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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Quote:
Originally Posted by Kubla
I think I have bought the sae 3 to sae 2 adapter and it is being shipped, if not I just wasted 60 dollars
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You just wasted $60. What you probably bought is what you already have. The DT466 has a #2 with a #3 bolted to it if you have an AT545. I wouldn't proceed any further without going to a Allison transmission shop and finding out exactly what you need. While there is nothing wrong with asking for advice on a or this forum, it is worth what you paid for it. Zero. I think very few on here have actually done this swap. I want to be one of those few but not enough $$$ or time.
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03-22-2015, 07:58 PM
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#10
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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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Quote:
Originally Posted by Booyah45828
You'll have to look at your current flywheel housing to see what you'll need. On my bus, it has an sae2 flywheel housing necked down to an sae3 adapter that mates to the transmission. You'll also have to see if your current flexplate will work with the new converter. I bet it would but you might need spacers changed to get it to sit at the right depth. After that, the transmission should bolt right up. As said previously, you'll have to check driveshaft length.
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The MT643 needs a #2 and the AT545 needs a #3. Usually a DT466 has both, one bolted onto the other for the AT545.
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03-23-2015, 11:01 AM
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#11
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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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Quote:
Originally Posted by crazycal
The MT643 needs a #2 and the AT545 needs a #3. Usually a DT466 has both, one bolted onto the other for the AT545.
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Yes, I forgot to mention that I'm currently using an at545 which has the neck down for the sae3 housing. He will likely have the same neck down which will need to be removed. That elimination of the neck down might require elimination/creation of spacers behind the flywheel to set up the correct converter distance/depth into the trans. Your driveshaft will also for sure have to be shortened because IIRC the mt643 is something like 4" longer then the at545 that you're removing.
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03-23-2015, 11:57 AM
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#12
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Bus Nut
Join Date: Dec 2014
Location: Florida
Posts: 584
Year: 1988
Coachwork: Blue Bird
Chassis: I.H.
Engine: DT360
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For what its worth, this makes me think about a cooler install if he doesn't have one now. 4" is a lot. Could the motor be mounted back farther with fabricated brackets so the drive shaft is long enough and then have enough room to place a cooler in front of the radiator? It would make room to move the radiator back which eliminates that problem. I suppose it depends on the room he has behind the motor. Just creative thinking here.
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03-23-2015, 06:10 PM
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#13
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Bus Geek
Join Date: Aug 2011
Location: Stony Plain Alberta Canada
Posts: 2,937
Year: 1992
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: 190hp 5.9 Cummins
Rated Cap: 72
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Quote:
Originally Posted by HolyBus
For what its worth, this makes me think about a cooler install if he doesn't have one now. 4" is a lot. Could the motor be mounted back farther with fabricated brackets so the drive shaft is long enough and then have enough room to place a cooler in front of the radiator? It would make room to move the radiator back which eliminates that problem. I suppose it depends on the room he has behind the motor. Just creative thinking here.
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Your better off modifying the drive shaft.
Moving a engine is way way more work. Many many connections to a ton of different things.
Nat
__________________
"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."
Patently waiting for the apocalypses to level the playing field in this physiological game of life commonly known as Civilization
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03-23-2015, 06:18 PM
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#14
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Bus Crazy
Join Date: Feb 2015
Location: Cincinnati, Ohio
Posts: 1,001
Year: 2000
Coachwork: Blue Bird
Chassis: International
Engine: TE 444
Rated Cap: 12
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with the MT643 there should be no tranny heating issues because of the lock up torque converter, the build in cooler will be sufficient
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03-24-2015, 12:28 PM
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#15
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Mini-Skoolie
Join Date: Jun 2014
Posts: 17
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The converter in the MT643 only locks in 3rd and 4th gears. So, if you're climbing steep hills, it's probably still a good idea to add a transmission cooler.
I have one on my bus, because we are driving through the mountains of Colorado with an AT542. It was required. We mounted it in the front bumper, only had to add one short section of hose from the radiator intercooler over to the oil cooler, and reused the old return line. Doing this while swapping the transmission would probably only add 10% more work.
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