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Old 03-20-2015, 09:49 PM   #1
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at545 to mt643 swap on dt466

has anyone done this swap and what do you have to change if you have?
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Old 03-21-2015, 09:40 AM   #2
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has anyone done this swap and what do you have to change if you have?
I'm going to have to swap my At545 out.

But I'm going to swap it for a Cummins 8.3 and md 3060 combo.

I will find a 8.3 with a 3060 already behind it.

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Old 03-21-2015, 11:55 AM   #3
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I think you're a bit ahead of me in this swap, but from what I've found, you're likely going to need to swap/remove/add an adapter between engine and trans as the two trans have different bolt patterns. And, I believe you have to adjust drive shaft length/connection as well as trans mount.
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Old 03-21-2015, 07:46 PM   #4
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if you accidentally roll your MT643 on it's side while trying to get it off the trailer, it will spill an incredible amount of tranny fluid on your driveway LOL
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Old 03-22-2015, 12:54 AM   #5
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Ha ha, woops.
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Old 03-22-2015, 01:44 AM   #6
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Only about 4 1/2 gallons.
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Old 03-22-2015, 02:56 PM   #7
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You'll have to look at your current flywheel housing to see what you'll need. On my bus, it has an sae2 flywheel housing necked down to an sae3 adapter that mates to the transmission. You'll also have to see if your current flexplate will work with the new converter. I bet it would but you might need spacers changed to get it to sit at the right depth. After that, the transmission should bolt right up. As said previously, you'll have to check driveshaft length.
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Old 03-22-2015, 07:33 PM   #8
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I think I have bought the sae 3 to sae 2 adapter and it is being shipped, if not I just wasted 60 dollars
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Old 03-22-2015, 08:54 PM   #9
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I think I have bought the sae 3 to sae 2 adapter and it is being shipped, if not I just wasted 60 dollars
You just wasted $60. What you probably bought is what you already have. The DT466 has a #2 with a #3 bolted to it if you have an AT545. I wouldn't proceed any further without going to a Allison transmission shop and finding out exactly what you need. While there is nothing wrong with asking for advice on a or this forum, it is worth what you paid for it. Zero. I think very few on here have actually done this swap. I want to be one of those few but not enough $$$ or time.
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Old 03-22-2015, 08:58 PM   #10
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You'll have to look at your current flywheel housing to see what you'll need. On my bus, it has an sae2 flywheel housing necked down to an sae3 adapter that mates to the transmission. You'll also have to see if your current flexplate will work with the new converter. I bet it would but you might need spacers changed to get it to sit at the right depth. After that, the transmission should bolt right up. As said previously, you'll have to check driveshaft length.

The MT643 needs a #2 and the AT545 needs a #3. Usually a DT466 has both, one bolted onto the other for the AT545.
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