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

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  #1  
Old 03-17-2019
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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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Mark Donahue, Mariposa, CA
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  #2  
Old 03-17-2019
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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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  #3  
Old 03-18-2019
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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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  #4  
Old 2 Weeks Ago
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The bus is back in the shop! Trans was down 1/2 Gal and can smell the clutches were hot, the power steering also leaked. They said it was from the pitman arm seal, I gave them the Model # HF64 TRW hope the can fix with out removing the gear.
They can not find the trans leak so I will have them remove the pan and check for stuff in it. Not sure what else to do at this time?
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Old 2 Weeks Ago
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Impress on the shop that the front axle comes off if trans removal is required. Tires off, U-bolts unscrewed, drop axle swing out of the way, don't have to remove pitman arm connection. Reman 643 shouldn't be too expensive, however a quality unit would be preferred over a budget fix. Get a reman on the floor so shop isn't waiting for a new trans if it comes to that. Cooler/heat exchangers need good flush, probably new hoses, not a place to deal with a shop that's tentative about the project.
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Old 2 Weeks Ago
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Thank you Mike: when in the shop before, they replaced the hoses to the cooler and the 2 filters & new dextron. along with power steering hoses and pump seal. They also did the breaks and alignment. It all looked good on our trip to "Q" (2 days each way).
MY main concern is the low fluid! Why was it low? Why can't they fine a leak?
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Old 6 Days Ago
Bob Horner Bob Horner is offline
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How long ago did they replace filters and hose? Did you check it after you drove it home from the shop?
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  #8  
Old 5 Days Ago
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I did a quick check on the fluid level (OK), there was fluid on the trans bolts and one was missing (the holes were not thru to the fluid & I put a new bolt in and checked all the others (they were tight).
We drove it to Q in AZ and back, just 45min from home it started to ack up.
They called last week and said the seal in the power steering box needs replaced. I asked them to replace the filters and new fluid anyway, then look again for leaks.
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Mark Donahue, Mariposa, CA
1978 FC 33', SB.
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2006 Jeep TJ Wrangler X
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Last edited by 78bbird; 5 Days Ago at 12:33 PM. Reason: added the trip.
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