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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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Old 4 Days Ago
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78bbird 78bbird is offline
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Default Allison MT 643 speedo

I pulled the speedo drive cable from the speedo to a box on the left frame to lube it.
What is this box? How does it work?
It has another cable going to the trans, a 1/2" hose and some electrical connectors on it.
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Mike Hohnstein Mike Hohnstein is offline
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Your description needs pictures for an accurate answer. Two cables are required to operate the transmission, shifter to selector lever and throttle position to modulator assembly in side of case behind the selector lever. Sounds like the speedo cable to box would be cruise control related.
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The pic's did not come out. It is the cruise control unit. I/2" hose goes to the vacuum pump, electrical must go to the control unit on steering wheel, other cable goes to the rear of trans. Thank you for the help.
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