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Old 03-23-2015, 12:01 PM   #11
Bus Nut
 
Join Date: May 2014
Location: West Ohio
Posts: 626
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
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Originally Posted by crazycal View Post
The MT643 needs a #2 and the AT545 needs a #3. Usually a DT466 has both, one bolted onto the other for the AT545.
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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Old 03-23-2015, 12:57 PM   #12
Bus Nut
 
Join Date: Dec 2014
Location: Florida
Posts: 584
Year: 1988
Coachwork: Blue Bird
Chassis: I.H.
Engine: DT360
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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Old 03-23-2015, 07:10 PM   #13
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
Quote:
Originally Posted by HolyBus View Post
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.
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
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Old 03-23-2015, 07:18 PM   #14
Bus Nut
 
Join Date: Feb 2015
Location: Cincinnati, Ohio
Posts: 539
Year: 2000
Coachwork: Blue Bird
Chassis: International
Engine: TE 444
Rated Cap: 12
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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Old 03-24-2015, 01:28 PM   #15
mtg
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Join Date: Jun 2014
Location: Denver, CO
Posts: 17
Year: 1995
Coachwork: Thomas
Chassis: International 3600
Engine: T444
Rated Cap: 39
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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