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Old 10-27-2009, 12:30 AM   #1
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Join Date: Sep 2008
Posts: 446
Year: 89
Coachwork: thomas
Engine: 7.3 diesel
how to tell which tranny

1989 thomas S1700 7.3 diesel has 1-2-3 D on the shifter
guessing its a 4 speed auto
anybody have an idea what came in these buses?

oh yeah its a shorty full body but a shorty
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Old 10-27-2009, 02:26 PM   #2
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Location: Twin Falls, Idaho
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which tranny

Slide under your bus on the curb side. There will be a 2X3 tag on trans side near the oil pan. Your trans is a AT 543, based on the passengers. This unit is very dependable with good care. The unit information is AT means Allison Transmission, 543 means 500 series about 750 pounds torque, 4 speeds, 3rd change made on this design. Most trans use a very good spin off filter for low repair. It is a good idea to have and use a trans temp gage. The fluid should be bright and shiney... Frank in Idaho
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Old 10-27-2009, 04:18 PM   #3
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Join Date: Sep 2008
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Year: 89
Coachwork: thomas
Engine: 7.3 diesel
Re: how to tell which tranny

appreciate the info, will slide under when it stops rainging
just put rebuilt injector pump on, ran ok with alot torque, seemed a little loud though
tks again
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