Reply
 
Thread Tools Display Modes
 
Old 11-24-2007, 11:25 AM   #1
Bus Geek
 
lapeer20m's Avatar
 
Join Date: Nov 2003
Location: near flint michigan
Posts: 2,653
who knows their allison transmissions???

i keep searching and can't find the answer.

according to the previous owner the new bus has an mtb743 automatic trans. I want to know how many speeds it has. I think it's an MT743...the B equals retarder i'm pretty sure.

perhaps he's mistaken and it's an ht743?

thanks
__________________
Quis custodiet ipsos custodes (who will watch the watchmen?)
lapeer20m is offline   Reply With Quote
Old 11-24-2007, 11:33 AM   #2
Site Team
 
crazycal's Avatar
 
Join Date: Feb 2007
Posts: 4,087
Re: who knows their allison transmissions???

I don't know about the others, but I don't think you're retarded.


I think there is a R after the model number if there is a retarder.
__________________
I'm hungry!

You Gotta Let Me Fly
crazycal is offline   Reply With Quote
Old 11-24-2007, 11:55 AM   #3
Site Team
 
crazycal's Avatar
 
Join Date: Feb 2007
Posts: 4,087
Re: who knows their allison transmissions???

Checked a book. The 700 series is a HT. I think the middle number is the number of gears.
__________________
I'm hungry!

You Gotta Let Me Fly
crazycal is offline   Reply With Quote
Old 11-24-2007, 12:32 PM   #4
Bus Geek
 
lapeer20m's Avatar
 
Join Date: Nov 2003
Location: near flint michigan
Posts: 2,653
Re: who knows their allison transmissions???

i can hear/feel the trans shift from first to 4th gear. I found the axle ratio, and the tire size is easy enough to come by as well as max rpm for a 6v71

max rpm: 2350
axle rato: 4.56:1
tire height: 41.3 inches
final drive ratio: 1:1

max speed 63.34


unless that trans has overdrive which is very unlikely, someone is not telling the truth when he states it'll cruise an indicated 70 or 75 mph on the speedo which he believes to be an actual 80 -85 mph. I tested the speedo vs my gps and found the speedo to be off less than 4% ie: when speedo sais 50 mph the bus is moving almost 52 mph according to gps.

wonder how i can identify the transmission....perhaps i can find a tag on the unit when i crawl under there.

GRRRRRRRRRRRR!!!
__________________
Quis custodiet ipsos custodes (who will watch the watchmen?)
lapeer20m is offline   Reply With Quote
Old 11-24-2007, 03:10 PM   #5
Bus Geek
 
lapeer20m's Avatar
 
Join Date: Nov 2003
Location: near flint michigan
Posts: 2,653
Re: who knows their allison transmissions???

i crawled under there and found the tag. Allison on their website states that the tag for there transmissions is 2" x 3" on located on the right rear of the transmission. That helped a lot. After scraping off oil/grease from the tag (it is a Detroit Diesel under the hood) i discovered it is an:

MTB647

I belive it is a variant of the MT647.....probably not so far removed from the 643.
__________________
Quis custodiet ipsos custodes (who will watch the watchmen?)
lapeer20m is offline   Reply With Quote
Old 11-24-2007, 07:59 PM   #6
Bus Geek
 
lapeer20m's Avatar
 
Join Date: Nov 2003
Location: near flint michigan
Posts: 2,653
Re: who knows their allison transmissions???

here is a photo of the transmission tag





this is a four speed transmission with a final drive ratio of 1:1
__________________
Quis custodiet ipsos custodes (who will watch the watchmen?)
lapeer20m is offline   Reply With Quote
Old 11-24-2007, 09:32 PM   #7
Bus Geek
 
the_experience03's Avatar
 
Join Date: Feb 2006
Location: Saint James, MN
Posts: 2,669
Send a message via MSN to the_experience03 Send a message via Yahoo to the_experience03
Re: who knows their allison transmissions???

That be an AT545 as best as I can tell.
__________________
http://farm4.static.flickr.com/3024/...09f20d39_m.jpg
Skooling it...one state at a time...
the_experience03 is offline   Reply With Quote
Old 12-01-2007, 12:24 AM   #8
Bus Crazy
 
Elliot Naess's Avatar
 
Join Date: Oct 2005
Location: Clearlake, Northern California
Posts: 2,116
Year: 1992
Coachwork: Blue Bird
Chassis: TC-2000 Frt Eng, Tranny:MT643
Engine: 5,9 Cummins
Rated Cap: 84
Re: who knows their allison transmissions???


I like this site for Allison information:
http://www.industrialautomatic.com/html/onhiway.htm

Click on "HT-series" to see the HT-700s.

Edit:
Some key info from that site:
http://www.skoolie.net/forum/viewtopic.php?f=6&t=1824
__________________
Elliot
Millicent The Bus - roof raised two feet, toy-hauler tailgate.
http://www.skoolie.net/forums/f11/th...gate-1564.html
Elliot Naess is offline   Reply With Quote
Old 12-14-2007, 08:27 PM   #9
Bus Crazy
 
Join Date: Oct 2004
Location: New England
Posts: 1,009
Year: 1993
Coachwork: Ward Genesis
Chassis: International
Engine: DT466/MT643
Rated Cap: 77
Re: who knows their allison transmissions???

WHOA! 2350RPM is too much for a 6V71 engine! Even 2250 was fire apparatus only! Keep it down to 2100RPM for normal use.
__________________
Jarlaxle
---------------------------------------------------------------------------------
Optimism is a mental disorder.
Jarlaxle 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
EEaT or Euro Engines and Transmissions! thjakits Conversion General Discussions 3 09-05-2014 07:16 PM
European engines and Transmissions thjakits Mechanical and Drivetrains 0 08-05-2014 08:54 PM
Allison 643 $500 TN GreyEagle Classifieds | Buy, Sell, Swap 0 07-15-2012 12:20 PM
CAT V8 Diesel and 6 spd Allison FF FRED Classifieds | Buy, Sell, Swap 0 03-08-2010 07:15 AM
Switch from Allison 643 to Allison 545 the_experience03 Conversion General Discussions 3 02-13-2008 09:44 PM

» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 07:33 AM.


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