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Old 09-18-2017, 11:10 PM   #1
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How to source a transmission upgrade

What is needed to source a transmission upgrade? My mechanic says he needs the serial for the transmission I want. I currently have 1998 5.9 12c w/ AT545. When I upgrade I want an MT643. I found this one on Craigslist. I've read the 545/643 is an easy swap - but what else do I need to know? https://baltimore.craigslist.org/pts...309146840.html


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Old 09-18-2017, 11:50 PM   #2
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Says out of pusher- Might be different.
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Old 09-19-2017, 04:34 PM   #3
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Says out of pusher- Might be different.


Excellent point. But still how do I properly source the right one? Serial?


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Old 09-19-2017, 05:19 PM   #4
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Pusher Should be the same transmission... the difference is in the rear axle. The engine and tranny turn the same way in my pusher at least.

The serial number is in the pictures on craigslist I would give your mechanic that number and the one from your transmission and see what he comes up with if your having him do the swap. I will tell you the housing is different on a 545 and 643 among other things

This is informative

https://www.google.com/amp/s/tatumsk...son-mt643/amp/
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Old 09-19-2017, 08:12 PM   #5
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With any mt643, there are a few things you need to consider. The main trans is the same, the valve body , torque converter, and governor are different between applications. Just installing the trans from some other rig can get you bad shift points, over or under revving and bad power and mileage. The best thing to do is get a trans from a rig like yours with the same engine and gearing.

As for swapping, you need a #2 flywheel housing (which you may allready have) flywheel and flexplate to fit. The cooler lines will be different. You will also need the driveshaft modified to fit or get one from the other bus.

I,m in the process of going from a manual to an mt643, It took a while to find a valve body for my application.
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Old 09-20-2017, 08:24 AM   #6
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Quote:
Originally Posted by bluebird90 View Post
With any mt643, there are a few things you need to consider. The main trans is the same, the valve body , torque converter, and governor are different between applications. Just installing the trans from some other rig can get you bad shift points, over or under revving and bad power and mileage. The best thing to do is get a trans from a rig like yours with the same engine and gearing.

As for swapping, you need a #2 flywheel housing (which you may allready have) flywheel and flexplate to fit. The cooler lines will be different. You will also need the driveshaft modified to fit or get one from the other bus.

I,m in the process of going from a manual to an mt643, It took a while to find a valve body for my application.
I had thought about changing our tranny too. I had no idea that there were so many considerations. I thought it was just a drop and swap kind of thing. I may just end up keeping mine.
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Old 09-20-2017, 12:56 PM   #7
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545 to 643 isn't too hard, and its a worthwhile upgrade if/when the 545 fails.
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Old 09-20-2017, 07:29 PM   #8
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I found just recently an attachment set up to add to my old 3-speed truck tranny to give it overdrive with nothing more than shortening the drive shaft.
And started wondering if they have one for the 545?
It was something like gearbox guys but i will have to find the sight again?
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Old 02-10-2018, 01:44 PM   #9
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So I found a used MT643 with only 41k miles not far from me -- for $500! Owner says it was pulled from a '98 bus and was connected to a 5.9 12v - just like my bus.

Let's say this is actually in good shape. What are some maintenance things I should do, regardless, before throwing it under my bus? I will have a mechanic do this, but I want a good understanding before I approach someone about it. Is there some measure of "refurbishing" that is always recommended?
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Old 02-10-2018, 03:34 PM   #10
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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.
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