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03-28-2020, 10:34 AM
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#1
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Mini-Skoolie
Join Date: Jun 2019
Location: Pasadena, TX
Posts: 15
Year: 1988
Chassis: Ford
Engine: 6.6L Ford/New Holland
Rated Cap: 36 Passengers
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Ford/New Holland 6.6L / MT-643
Anyone have the Ford/New Holland 6.6L with the Allison MT-643 tranny combination? My ‘88 Ford/Ward has the AT-545 and I have some questions before I purchase an MT- 643 that I found to upgrade mine. Any help is much appreciated. Thanks in advance.
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03-28-2020, 12:38 PM
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#2
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Bus Geek
Join Date: Dec 2016
Location: Weeki Wachee, FL
Posts: 3,056
Year: 1997
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: Cummins 5.9
Rated Cap: 72
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I've got a friend with the 7.8L ford/new holland with the mt643 in it. I understand the 7.8 and 6.6 to be mostly the same engine but a different stroke. I can pass your questions along if you like.
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03-28-2020, 04:57 PM
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#3
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Bus Geek
Join Date: May 2016
Location: Eastern WA
Posts: 6,402
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
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Do New Holland tractor dealers work on the old 6.6/7.8's?
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03-29-2020, 03:49 PM
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#4
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Mini-Skoolie
Join Date: Jun 2019
Location: Pasadena, TX
Posts: 15
Year: 1988
Chassis: Ford
Engine: 6.6L Ford/New Holland
Rated Cap: 36 Passengers
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Brokedown, I had wondered if I’d need an adapter plate to mount the MT-643 to my 6.6L? Today, I had a chance to pull off the floorboard panel covering above the bellhousing on mine and found the answer I’ve been searching for. Since my 6.6L/AT-545 has a SAE #3 bellhousing, and the MT-643 I found has a SAE #2 being larger in diameter, I figured there had to be an adapter plate somewhere. Answer: the adapter plate is already mounted on my engine to attach the AT-545. I just have to remove the adapter plate to install the MT-643. Problem solved. And thanks for offering to pass on my question. If in fact I do come up with any questions about the 643, I will message you. Thanks again...
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03-29-2020, 04:20 PM
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#5
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Mini-Skoolie
Join Date: Jun 2019
Location: Pasadena, TX
Posts: 15
Year: 1988
Chassis: Ford
Engine: 6.6L Ford/New Holland
Rated Cap: 36 Passengers
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PNW STEVE, I can’t answer your question about New Holland tractors, but to say, I wouldn’t think so. I would think an older diesel mechanic would be your best bet. If you’re a do-it-yourself kind of guy, google it and jump right in. YOUTUBE has a lot of videos as well. Good luck.
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03-29-2020, 06:31 PM
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#6
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Bus Geek
Join Date: May 2014
Location: West Ohio
Posts: 3,829
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The flywheel housing adapter plate is just the beginning of the difference. Since the at545 and mt643 have different torque converters(because of the lockup clutch), most swaps will require a different flexplate/spacer/flywheel arrangement. Check into that as well before you rip everything apart, get stuck, and need to move the bus.
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03-29-2020, 08:11 PM
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#7
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Mini-Skoolie
Join Date: Jun 2019
Location: Pasadena, TX
Posts: 15
Year: 1988
Chassis: Ford
Engine: 6.6L Ford/New Holland
Rated Cap: 36 Passengers
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Will do. Thanks for your input.
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06-26-2020, 08:21 PM
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#8
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Bus Nut
Join Date: Jan 2018
Location: Brevard County, FL
Posts: 911
Year: 1990
Coachwork: Bluebird
Chassis: Ford
Engine: 6.6 New Holland Diesel
Rated Cap: 60 kids, 10 window
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Anyone have know the location of the oil pressure sensor on the 6.6? I had a flood come in the dash thw othwr day amd now my gauge isn't working. I was thinking of juat bypassing the old gauge and adding a new one but I'm not quite sure where the gauge is located. I've already searched google. Thanks!
__________________
Nick
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07-14-2020, 09:21 PM
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#9
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Mini-Skoolie
Join Date: Jun 2019
Location: Pasadena, TX
Posts: 15
Year: 1988
Chassis: Ford
Engine: 6.6L Ford/New Holland
Rated Cap: 36 Passengers
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oil pressure sensor location
l will look at my engine manual when I get back home this weekend and see if I can help you out. Sorry, I haven't been on the forum for a while and just saw your question tonight.
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10-10-2024, 01:33 AM
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#10
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New Member
Join Date: Oct 2024
Posts: 1
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Quote:
Originally Posted by brokedown
I've got a friend with the 7.8L ford/new holland with the mt643 in it. I understand the 7.8 and 6.6 to be mostly the same engine but a different stroke. I can pass your questions along if you like.
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Any chance you can ask your friend what flywheel/flex plate will join the 6.6l/7.8l to the mt643?
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