Reply
 
Thread Tools Display Modes
 
Old 07-19-2014, 09:09 AM   #1
New Member
 
Join Date: Jul 2014
Posts: 7
Mt643 or mt653

Ill be swapping out a at545 soon. I can get a mt643 or mt653 same price. Has any one done this and any reason not to go with the mt653. Oh it's behind a dt466
stryker is offline   Reply With Quote
Old 07-23-2014, 11:54 PM   #2
Site Team
 
crazycal's Avatar
 
Join Date: Feb 2007
Posts: 4,087
Re: Mt643 or mt653

The 653 is a great, great granny low first gear. I think it's a 8.something to 1 first gear. I was told you had to come to a complete stop to shift into and out of first. I am interested in what extra parts you needed for the swap.
__________________
I'm hungry!

You Gotta Let Me Fly
crazycal is offline   Reply With Quote
Old 07-24-2014, 07:30 AM   #3
New Member
 
Join Date: Jul 2014
Posts: 7
Re: Mt643 or mt653

What I am getting with the trans is flywheel, pres. Plate, and flanges.
I know I will need to shorten the drive shaft and change the yoke, run new 1/2 cooler lines and replace the cooler. As far as the cross member I don't know if it will need to be swapped or moved, If need be I will make one. Also I'm told that the dt466 has a adaptor to tun the mt545 that needs to be removed then the mt653 will bolt directly to the motor.
stryker is offline   Reply With Quote
Old 07-24-2014, 07:38 AM   #4
Site Team
 
Join Date: Jun 2014
Location: southwest lowsyana
Posts: 542
Year: 1988
Coachwork: ward
Chassis: international
Engine: dt360a
Rated Cap: 65
Re: Mt643 or mt653

will watch this post. does your 545 have a crossmember? mine (dt360/545) does not have a crossmember. maybe it fell off!
claydbal is offline   Reply With Quote
Old 07-24-2014, 12:19 PM   #5
Site Team
 
crazycal's Avatar
 
Join Date: Feb 2007
Posts: 4,087
Re: Mt643 or mt653

I think the 545 has a adapter from #3 to a #2. You can see it if you look at the bell housing. I am dying to put in a 643 but afraid to tackle the project until I know exactly what I need for parts. I don't want to start then find out I need to spend $2000 for this part and that part. I can't really get a straight answer from the Allison guys.
__________________
I'm hungry!

You Gotta Let Me Fly
crazycal is offline   Reply With Quote
Old 07-29-2014, 10:01 AM   #6
Site Team
 
bansil's Avatar
 
Join Date: Nov 2011
Location: MNT CITY TN
Posts: 5,039
Re: Mt643 or mt653

CC that is my issue right now also
__________________
Our build La Tortuga
Accept the challenges so that you can feel the exhilaration of victory.
George S. Patton
bansil is offline   Reply With Quote
Old 08-19-2014, 09:37 PM   #7
Site Team
 
crazycal's Avatar
 
Join Date: Feb 2007
Posts: 4,087
Re: Mt643 or mt653

Quote:
Originally Posted by bansil
CC that is my issue right now also

Werd.
__________________
I'm hungry!

You Gotta Let Me Fly
crazycal is offline   Reply With Quote
Old 01-16-2015, 05:10 PM   #8
Bus Nut
 
sojourner's Avatar
 
Join Date: Aug 2013
Posts: 453
Year: 1995
Engine: DT408
I have a hard time getting a straight answer out of either and International dealer, service people or transmission guys. It's like no-one actually works on school buses much at all. Frustrating, to be sure. Maybe we should start a "School of the Skoolie" trade school or something like that. Makes one wonder just what do the service guys in the school sheds actually see as far as repairs go?
__________________
I am an sojourner in the earth; hide not Your Commandments from me. Psalm 119:19

Here is the patience of the saints; here are the ones keeping the commandments of YAHWEH, and the faith of Yahshua. Rev. 14:12
sojourner is online now   Reply With Quote
Old 01-16-2015, 05:22 PM   #9
Bus Crazy
 
Join Date: Jul 2011
Location: Winlcok, WA
Posts: 1,607
If you can get a MT653 for the same price as a MT643 I would go with the MT653.

In either case you are going to have to do some fabrication work because the MT series is larger than the AT series of transmissions.

If you do go with the MT653 you may want to consider changing out your rear gears. Since it has the deep low first gear it won't matter if your normal first gear isn't really low. But you will get the benefit of basically an OD gear. 4.10 gears will get you better than 70 MPH top speed instead of the normal gearing that give a top speed of about 58 MPH.
cowlitzcoach is offline   Reply With Quote
Old 01-16-2015, 05:24 PM   #10
Bus Crazy
 
Join Date: Jul 2011
Location: Winlcok, WA
Posts: 1,607
Or you could purchase this bus that already has an MT653 and rear gears that give it a top speed in excess of 70 MPH.


http://showroom.auction123.com/thebusdealercom/inventory/9869/1990/International/BB/1HVBB27N1LH288586.html
cowlitzcoach is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to tell AT545 from MT643, w/pix & specs Elliot Naess Mechanical and Drivetrains 66 04-19-2017 02:00 PM
Service life of MT643 Transmission Joe Monstermaker Mechanical and Drivetrains 5 02-28-2010 10:10 PM
at545 to mt643 mounting questions adamanderr Mechanical and Drivetrains 8 02-24-2009 07:43 PM
Hate to, But Have to...DT466/MT643 for sale reprobate Classifieds | Buy, Sell, Swap 0 04-27-2008 10:36 AM
Does a MT643 fit instead of a AT545 ????? Protecx Conversion General Discussions 1 02-09-2007 10:14 PM

» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 11:59 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.