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Old 03-17-2009, 10:04 PM   #11
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Re: How to tell AT545 from MT643, w/pix & specs

So how did you plumb it in? Just inline on the cooler lines?
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Old 03-17-2009, 10:11 PM   #12
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Tank is in series with 1/2 inch cooler line. About 3 gallons of surplus allows for a really long hill with a tremendous load. And the challenge is kool. Frankj
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Old 04-10-2010, 05:46 PM   #13
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Re: How to tell AT545 from MT643, w/pix & specs

Here's a current link to the Allison operators manual (where those images were lifted from)

http://www.allisontransmission.com/publ ... 1334EN.jsp
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Old 04-10-2010, 07:02 PM   #14
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Re: How to tell AT545 from MT643, w/pix & specs


Not the exact same images, but that's trivial. WOW what a wealth of information! I printed out all 50 pages. Thanks, Scosol!
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Old 08-23-2011, 05:31 PM   #15
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Re: How to tell AT545 from MT643, w/pix & specs

Anybody ever heard of the Allison MT 640 tranny? It is in my 1973 Blue Bird that has the 1160 CAT motor. Does this tranny lock in in 3rd and 4th gear like the 643?
Thanks for any knowledge you may have.
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Old 08-24-2011, 08:20 AM   #16
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Re: How to tell AT545 from MT643, w/pix & specs

I found a website with a pdf file of Allison tranny info.

My tranny does have lockup. Here is the link:


http://www.allisontransmission.com/serv ... 1334EN.pdf
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Old 08-28-2012, 05:34 PM   #17
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Re: How to tell AT545 from MT643, w/pix & specs

Yes, The 640 has same tourqe and HP ratings but no electronics.

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Old 10-20-2012, 09:38 AM   #18
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Re: How to tell AT545 from MT643, w/pix & specs

Great info

For those of us with the AT545 would we be able to pull a Trailer? I was planning on pulling a car trailer behind me on our trips with the Mini-Van loaded onto it. Will I burn up the tranny if I do? My bus came with the external tranny cooler and filter. Just wanting to know if I should scatch those plans or not. I was also wondering if I should change the tranny fluid? I know in a car/Lt Truck if you dont change the tranny fluid at the recommended intervals ya shouldn't change it at all. (at least thats what my friend that owns a transmission repair shop told me) not sure about these bigger trannys.
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Old 10-20-2012, 11:06 AM   #19
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Re: How to tell AT545 from MT643, w/pix & specs

Quote:
Originally Posted by kimberlink
Great info

For those of us with the AT545 would we be able to pull a Trailer? I was planning on pulling a car trailer behind me on our trips with the Mini-Van loaded onto it. Will I burn up the tranny if I do? My bus came with the external tranny cooler and filter. Just wanting to know if I should scatch those plans or not. I was also wondering if I should change the tranny fluid? I know in a car/Lt Truck if you dont change the tranny fluid at the recommended intervals ya shouldn't change it at all. (at least thats what my friend that owns a transmission repair shop told me) not sure about these bigger trannys.
I was wondering this as well, im going to put a hitch on, then built a deck to hold 2 small scooters. Later down the road if the scooters dont work for us i would like to tow a small car, but not sure how well the 545 would hold up
maybe should start another thread on this subject?

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Old 10-22-2012, 11:29 PM   #20
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Re: How to tell AT545 from MT643, w/pix & specs

Quote:
Originally Posted by Elliot Naess

AT545 -- max 235 HP, 445 lb ft, 30.000 Lbs GVWR;

MT643 -- max 250 HP, 640 lb ft, 73.280 Lbs GVWR;
You may want to find out the horsepower and torque output of the engine, and figure out the gross weight of the vehicle combination.
Beyond that, it is a matter of fuel economy -- the MT643 is more efficient.

Those are the numbers. Your gut feeling may vary.
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