Reply
 
Thread Tools Display Modes
 
Old 02-10-2018, 03:53 PM   #11
Almost There
 
natedlee's Avatar
 
Join Date: Mar 2017
Location: Maryland
Posts: 96
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000
Engine: Cummins 5,9 12V
Rated Cap: 24 seats, 3 wheelchairs
Quote:
Originally Posted by Tango View Post
If it is in working order that is a deal. But make sure you get the shifter, all harnesses, any controllers and dipstick with it. They can add up top much more than the $500 in a heartbeat.
Awesome thanks - I wouldn't have known to ask about those.

Turns out the seller is a diesel mechanic @ Cummins and is being quite helpful answering all of my questions. He says it's in great condition and worked perfectly when it was taken out of a mobile art museum that would drive around and visit schools.

What's the best way for a layman like myself to determine if I have an SAE2 or SAE3 bell housing?
natedlee is offline   Reply With Quote
Old 02-10-2018, 03:56 PM   #12
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 7,146
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
I believe all the Cummins 5.9's (as well as 4BT's) are all SAE 3 but you mechanic friend can tell you for sure.
Tango is offline   Reply With Quote
Old 02-10-2018, 03:58 PM   #13
Almost There
 
natedlee's Avatar
 
Join Date: Mar 2017
Location: Maryland
Posts: 96
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000
Engine: Cummins 5,9 12V
Rated Cap: 24 seats, 3 wheelchairs
Quote:
Originally Posted by Tango View Post
I believe all the Cummins 5.9's (as well as 4BT's) are all SAE 3 but you mechanic friend can tell you for sure.
Yeah he's saying it most likely is SAE 3, but sometimes they can be different. When it's done raining I'll try to figure out of there's an adapter or not.

Cool thanks for your help!
natedlee is offline   Reply With Quote
Old 04-23-2018, 08:43 AM   #14
Almost There
 
natedlee's Avatar
 
Join Date: Mar 2017
Location: Maryland
Posts: 96
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000
Engine: Cummins 5,9 12V
Rated Cap: 24 seats, 3 wheelchairs
This has turned into a much bigger ordeal than expected. :/ The MT643 in fact does not fit my flywheel so the shop has been trying to source parts and both Cummins and Allison have been giving them the runaround. Other issues are less problematic, but the MT643 has a mechanical speedometer and my AT545 has an electric one, so they need to convert it. Also something I never considered is that the MT643 requires beefier driveshaft ujoints than the 545. So they are recommending replacing the rear diff connector with a larger one, so that has to be dealt with as well.

Anyway - it's been weeks and little progress. The shop that has it is a charter bus company here in MD.
natedlee is offline   Reply With Quote
Old 04-23-2018, 10:13 AM   #15
Bus Geek
 
Join Date: May 2009
Location: Columbus Ohio
Posts: 9,117
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
talk to the folks at Custom Automatic Conversions (formerly cummins allison conversions).. and see if they can help wioth getting the corrdect part numbers for the adapters.

as for the driveshaft yolks and what not.. sure th3 643 might want them if you were running it behind a super powerful engine, but they arent required.. shortening the driveshaft is required and any shop can do that..

John bloem swapped a 545 for a 643 (yes on a navistar not a cummins) but the rear part didnt require alterations for the driveline / rear end.

speedometer, if the 643 you have has a cable only outpuit connection then you can get a cable to electronic converter device... dakota digital makes them.. it screws onto the cable output of a trans and converts it to electronic pulses.. some of them are programmable, you are shooting for 16 puklses per driveshaft rotation to match the 545..

you *MAY* be able to unscrew the cable speed sensor from the 643 and insert the 545 sensor and have it pick up the pulses as the gear goes bythe sensor.. the MT643 was also designed at 16 pulses per driveshaft rev..
-Christopher
cadillackid is offline   Reply With Quote
Old 04-23-2018, 10:15 AM   #16
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 13,805
Year: 2004
Coachwork: IC
Chassis: CE300
Engine: DT466E
Rated Cap: 32
Quote:
Originally Posted by cadillackid View Post
talk to the folks at Custom Automatic Conversions (formerly cummins allison conversions).. and see if they can help wioth getting the corrdect part numbers for the adapters.

as for the driveshaft yolks and what not.. sure th3 643 might want them if you were running it behind a super powerful engine, but they arent required.. shortening the driveshaft is required and any shop can do that..

John bloem swapped a 545 for a 643 (yes on a navistar not a cummins) but the rear part didnt require alterations for the driveline / rear end.

speedometer, if the 643 you have has a cable only outpuit connection then you can get a cable to electronic converter device... dakota digital makes them.. it screws onto the cable output of a trans and converts it to electronic pulses.. some of them are programmable, you are shooting for 16 puklses per driveshaft rotation to match the 545..

you *MAY* be able to unscrew the cable speed sensor from the 643 and insert the 545 sensor and have it pick up the pulses as the gear goes bythe sensor.. the MT643 was also designed at 16 pulses per driveshaft rev..
-Christopher
Listen to this guy, he's a GENIUS!!
__________________
.
Roll Your Own Build Thread
EastCoastCB is offline   Reply With Quote
Old 04-23-2018, 10:50 AM   #17
Almost There
 
natedlee's Avatar
 
Join Date: Mar 2017
Location: Maryland
Posts: 96
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000
Engine: Cummins 5,9 12V
Rated Cap: 24 seats, 3 wheelchairs
Quote:
Originally Posted by cadillackid View Post
talk to the folks at Custom Automatic Conversions (formerly cummins allison conversions).. and see if they can help wioth getting the corrdect part numbers for the adapters.

as for the driveshaft yolks and what not.. sure th3 643 might want them if you were running it behind a super powerful engine, but they arent required.. shortening the driveshaft is required and any shop can do that..

John bloem swapped a 545 for a 643 (yes on a navistar not a cummins) but the rear part didnt require alterations for the driveline / rear end.

speedometer, if the 643 you have has a cable only outpuit connection then you can get a cable to electronic converter device... dakota digital makes them.. it screws onto the cable output of a trans and converts it to electronic pulses.. some of them are programmable, you are shooting for 16 puklses per driveshaft rotation to match the 545..

you *MAY* be able to unscrew the cable speed sensor from the 643 and insert the 545 sensor and have it pick up the pulses as the gear goes bythe sensor.. the MT643 was also designed at 16 pulses per driveshaft rev..
-Christopher
Thanks a ton! I will be passing this along to them!!
natedlee is offline   Reply With Quote
Old 04-27-2018, 02:24 PM   #18
Almost There
 
natedlee's Avatar
 
Join Date: Mar 2017
Location: Maryland
Posts: 96
Year: 1998
Coachwork: Blue Bird
Chassis: TC2000
Engine: Cummins 5,9 12V
Rated Cap: 24 seats, 3 wheelchairs
Quote:
Originally Posted by cadillackid View Post
talk to the folks at Custom Automatic Conversions (formerly cummins allison conversions).. and see if they can help wioth getting the corrdect part numbers for the adapters.

as for the driveshaft yolks and what not.. sure th3 643 might want them if you were running it behind a super powerful engine, but they arent required.. shortening the driveshaft is required and any shop can do that..

John bloem swapped a 545 for a 643 (yes on a navistar not a cummins) but the rear part didnt require alterations for the driveline / rear end.

speedometer, if the 643 you have has a cable only outpuit connection then you can get a cable to electronic converter device... dakota digital makes them.. it screws onto the cable output of a trans and converts it to electronic pulses.. some of them are programmable, you are shooting for 16 puklses per driveshaft rotation to match the 545..

you *MAY* be able to unscrew the cable speed sensor from the 643 and insert the 545 sensor and have it pick up the pulses as the gear goes bythe sensor.. the MT643 was also designed at 16 pulses per driveshaft rev..
-Christopher
I talked with KC and she had fond things to say about you. She also said this is a tough conversion b/c she has no idea where to source an adapter plate -- and she may have convinced me to go the route of a 1000HS in the process of explaining the benefits of the better transmission. Awesome lady -- great advice -- now I'm freaking out about what makes the most sense. I can't seem to find a solid lead on an adapter plate for this, so maybe I need to scrap the 643 idea and get the better trans. Any thoughts?
natedlee is offline   Reply With Quote
Old 04-27-2018, 09:29 PM   #19
Bus Crazy
 
Join Date: Apr 2013
Location: Colorado
Posts: 1,453
Year: 1993
Coachwork: bluebird
Engine: 5.9 Cummins, Allison AT1545
Rated Cap: 2
having swapped out a 545 myself (no more speedo), i don't think i'd go thru the hassle again for another 4 speed. i'd want at least 1 overdrive.

if i were to start over, instead of swapping transmissions, i'd invest in a 4.10 ring gear for the pumpkin.
__________________
.
Turfmobile Build Thread
turf is offline   Reply With Quote
Old 04-27-2018, 09:53 PM   #20
Bus Geek
 
EastCoastCB's Avatar
 
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 13,805
Year: 2004
Coachwork: IC
Chassis: CE300
Engine: DT466E
Rated Cap: 32
Quote:
Originally Posted by turf View Post
having swapped out a 545 myself (no more speedo), i don't think i'd go thru the hassle again for another 4 speed. i'd want at least 1 overdrive.

if i were to start over, instead of swapping transmissions, i'd invest in a 4.10 ring gear for the pumpkin.
My 98 shorty had a 444e and 545 with 4.10 rear.
the thing would do 70+ but the trans puts a TON of heat into the cooling system and it really would have been better off with lower gears or a trans with lockup tc.
__________________
.
Roll Your Own Build Thread
EastCoastCB 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


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:12 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2018, vBulletin Solutions, Inc.