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Old 10-19-2018, 01:00 PM   #1
Mini-Skoolie
 
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Year: 1990
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Engine: DT360
Swapping a AT545 for a MT643 behind a DT360

Been looking at possible transmission upgrades for my 1990 Blue bird. It has the DT360 and AT545. When I purchased the bus I had about a 40 mile trip on the highway home. The bus would do 65 but really high rpm, managed 60mph easily though. Would swapping in the MT643 net me any MPH and would it bolt up? Found a MT463 about 3hours from me. The person I would be buying it from has a DT466E bolted to it. Said I can have the bell housing adapter, fly wheel, flex plate and TQ converter.
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Old 10-19-2018, 01:16 PM   #2
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Originally Posted by JBK_27 View Post
Been looking at possible transmission upgrades for my 1990 Blue bird. It has the DT360 and AT545. When I purchased the bus I had about a 40 mile trip on the highway home. The bus would do 65 but really high rpm, managed 60mph easily though. Would swapping in the MT643 net me any MPH and would it bolt up? Found a MT463 about 3hours from me. The person I would be buying it from has a DT466E bolted to it. Said I can have the bell housing adapter, fly wheel, flex plate and TQ converter.
The 643 won't get you any more speed. It will give you more efficiency and less heat in the cooling system. Its a GREAT upgrade.
But you'll need highway gearing in the rear end to bring the cruising rpm's down. What's your rear axle ratio?
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Old 10-19-2018, 01:30 PM   #3
Mini-Skoolie
 
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Not sure on the axle ratio, will there be a tag on it??? I can pick up the MT643 for $300.
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Old 10-19-2018, 01:34 PM   #4
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Swapping to a mt643 will actually slightly improve your highway cruising speed. The ratios are the same, but you'll be eliminating the slip. But this is more of a technicality, the real advantage is that you'll be putting more of your power to the road instead of turning it into heat.

There might be a tag on the axle. My cluebird lists the ratio on a tag above the windshield, my thomas doesn't. You may also be able to find it by running your vin/body number on bluebird's vantage site.
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Old 10-19-2018, 02:11 PM   #5
Mini-Skoolie
 
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I'm really curious if the stall will be correct for my 360 being that the trans is coming off of a 466E.
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Old 10-19-2018, 02:56 PM   #6
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ive had 2 different torque converters in my bus. iirc, i went from as 1300 to a 1900 stall speed.

they both worked fine. the new one, the 1900, launches me faster. which i like.

i have a 5.9 that had an AT545 and swapped into an AT1545.

ymmv
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Old 10-19-2018, 03:00 PM   #7
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ive had 2 different torque converters in my bus. iirc, i went from as 1300 to a 1900 stall speed.

they both worked fine. the new one, the 1900, launches me faster. which i like.

i have a 5.9 that had an AT545 and swapped into an AT1545.

ymmv
Is the AT-1545 a direct swap for the AT-545? If so, I would think that would be a good upgrade path for 545 owners.
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Old 10-19-2018, 03:02 PM   #8
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Is the AT-1545 a direct swap for the AT-545? If so, I would think that would be a good upgrade path for 545 owners.
I don't if its direct. Turf is REALLY good at working on stuff and IIRC it took him quite a bit of effort.

CaddilacKid will know ALL about what you need to swap a 643 for a 545 behind a DT360. He JUST did this swap on his bus.
$300 for the whole kit and kaboodle is a good deal, IMO.
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Old 10-19-2018, 05:12 PM   #9
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EC is right, it is not a direct swap.

no one knew until its too late.
the lockup makes the TC sticks out about an inch further than the non locking 545.

pretty sure any swap is going to take some custom parts. i don't know the details of 643 swap. but find a 643 that was behind the same engine you have now. that will make sure you have all the parts you need.

the AT1545 was only mated to a cat motor with a much larger flywheel. i ended up making my own spacer to match the distance between the cummins flywheel and the TC.
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Old 10-19-2018, 05:33 PM   #10
Mini-Skoolie
 
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If the deal holds I’m going to go pick it up next weekend. Like I said he has the bell housing and everything. That bell housing should bolt to my 360 with no modification.
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