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Old 03-03-2018, 09:09 AM   #1
Mini-Skoolie
 
Join Date: Feb 2018
Posts: 13
Retarder for at545

I thought I had it all figured out.
Reality is I have to drive a 93 dt466/545 loaded with machinery and towing a fancy jeep 1000 miles in the winter for my maiden voyage.
No retarder.
So can I buy one? Seems like they make them but searching the internet for a retarder that would work is a bit frustrating, especially from my phone.

Driving from portland to LA more or less


Bus:
93 international. Dt466/Allison 545

Has brand new tires, engine was pulled and gone through, injector pump rebuilt, no rust, 135k on odometer, trailer hitch, seats out fo
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Old 03-03-2018, 09:13 AM   #2
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Location: Tahoe
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Year: 1997
Coachwork: International
Chassis: 3000RE
Engine: T444E w/ MT643
Rated Cap: 84 pass, 40'
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Originally Posted by mosierpat View Post
I thought I had it all figured out.
Reality is I have to drive a 93 dt466/545 loaded with machinery and towing a fancy jeep 1000 miles in the winter for my maiden voyage.
No retarder.
So can I buy one? Seems like they make them but searching the internet for a retarder that would work is a bit frustrating, especially from my phone.

Driving from portland to LA more or less


Bus:
93 international. Dt466/Allison 545

Has brand new tires, engine was pulled and gone through, injector pump rebuilt, no rust, 135k on odometer, trailer hitch, seats out fo
The mechanic told me that cold weather would help keep the transmission from overheating.

Sent from my XT1585 using Tapatalk
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Old 03-03-2018, 09:27 AM   #3
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Join Date: Mar 2011
Location: Port angeles, Wa
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Year: 90
Coachwork: bluebird conventional
Chassis: international
Engine: dt466
Rated Cap: 72
The AT545 never came with a retarder. Depending on the size of the bus you have 2 options. Go to an MT643 with a retarder or get a magnetic retarder like a Telma. If this bus has a dt466, I question if you actually have the 545. Thats kind of a weak trans for a larger bus and a dt466. You might really have an mt643, which would give you some engine braking in the mountains.
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Old 03-03-2018, 09:38 AM   #4
Mini-Skoolie
 
Join Date: Feb 2018
Posts: 13
How can I identify the trans?
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Old 03-03-2018, 09:41 AM   #5
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Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
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Take a look at the pix on the page below. They are quite different in appearance.

https://tatumskoolie.wordpress.com/2...allison-mt643/
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Old 03-03-2018, 10:08 AM   #6
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Originally Posted by bluebird90 View Post
The AT545 never came with a retarder. Depending on the size of the bus you have 2 options. Go to an MT643 with a retarder or get a magnetic retarder like a Telma. If this bus has a dt466, I question if you actually have the 545. Thats kind of a weak trans for a larger bus and a dt466. You might really have an mt643, which would give you some engine braking in the mountains.
Many thousands of buses have the DT466/AT545 combination.

Usually the engine is tuned to 190hp.
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Old 03-03-2018, 10:56 AM   #7
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Join Date: Feb 2018
Location: Tahoe
Posts: 513
Year: 1997
Coachwork: International
Chassis: 3000RE
Engine: T444E w/ MT643
Rated Cap: 84 pass, 40'
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Originally Posted by mosierpat View Post
How can I identify the trans?
Call your local International dealer with the last 8 of the VIN and ask them to email you your "line set ticket."

This has ALL THE INFO on your bus. Those are the magic words! Print a copy to keep in the bus for anyone that might work on it. It has part numbers of your parts!

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Old 03-03-2018, 01:13 PM   #8
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Location: Frisco, Texas
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Year: 1998
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Chassis: International 3800
Engine: Dt466e
Rated Cap: 71
i couldnt read the tag on side of mine, but its very easy to see difference. towards front of trans

in this picture, its the threaded holes to the right of the tag. mt643 has 4 in square, only 2 on at545
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Old 03-03-2018, 01:32 PM   #9
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Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
One note on Line Set info...great data but most of these units have had repairs and often major parts replaced. Don't assume it is still exactly as it left the factory. Best to confirm what you are dealing with.
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Old 03-03-2018, 07:33 PM   #10
Mini-Skoolie
 
Join Date: Feb 2018
Posts: 13
Sink or swim I leave tomorrow

Should be exciting. Thanks for the replies!
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Old 03-03-2018, 07:45 PM   #11
Mini-Skoolie
 
Join Date: Feb 2018
Posts: 13
So looks like mt trans.

MT for mountains. No?
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Old 03-03-2018, 07:52 PM   #12
Mini-Skoolie
 
Join Date: Feb 2018
Posts: 13
Looks like the mt643

MT for mountains baby
Thanks jjhwick119
I'll try it out first but I feel relieved now

Any tips on driving that tranny? I had a commercial lic 20 years ago so driven air brakes. But anything I can learn I'll try to use.

Thanks so much for the input!
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Old 03-03-2018, 10:20 PM   #13
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Join Date: Jun 2016
Location: Orange County, CA
Posts: 855
Year: 1990
Coachwork: integral
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
The MT6xx series is for medium trucks such as delivery and short-haul trucks (and many school buses), and it usually has lockup in 3rd and 4th gears. (The AT is for pickup/automobile trucks and has no lockup, and the HT is for heavy trucks with lockup in the top three gears.) The locking torque converter will help you get up and down hills OK - just remember to descend no faster than you climbed and in no higher gear than you climbed in, and keep the revs up (no lugging) by manually down-shifting when necessary. If you're keeping to I-5 you'll have some grades at Shasta and later at the Grapevine: keep in the right lane with the big boys and don't be in a hurry when you're in the mountains.

Allison transmissions always have an ID plate, so you'll need to get underneath with a flashlight and a rag to know for sure what you have.

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