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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 12-18-2018
i_ralley i_ralley is offline
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Default Trans rebuild?

My bus has a four speed Allison trans. On my last outing and the buses first long trip in 7 years by the end of 9 hours of travel over two days. I pulled the dip Stick to check fluid level and smell. It had a burnt smell and the fluid was just changed before we left. Once back home i had the pan pulled to fix a leak and change the fluid again. There was a lot of dark sludge on the bottom of the pan so the shop is recommending a rebuild or exchange.

I wondered what is the best route to go and also what makesence from a cost perspective.

The trans performs normally at the moment
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Old 12-18-2018
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Revision Revision is offline
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Cost-wise a rebuild will be cheaper assuming it's usable and straight forward.



Sludge is caused by the normal wear and tear of the internals as the transmission ages. Has it ever been rebuilt? Has the oil religiously been changed? Normal changing of the fluid removes the sludge and helps to keep wear to the designed minimum.


If it is running well now, I'd clean out the sludge, change the oil again, and then run it for a few thousand miles. Pull an oil sample for one of the many mail order analysis companies, and drop the pan to see if what you're experiencing was a cumulative buildup, or if it is starting to degrade at a high rate.
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Old 12-18-2018
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FYI this is who I've used in the past: https://www.blackstone-labs.com


Any Cat dealer will have access to their S.O.S. analysis program which does the same thing.
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Old 12-18-2018
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Lots of info on the forum about this as many have faced it, including me. Local mechanic pulled transmission, sent to Camoratta for overhaul then local mechanic reinstalled. $2800 for rebuilding, $4500 total. Not too bad
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