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Trans service
When we 1st bought the bus I took it to a Detroit/allison dealer and had the valves adjusted and they serviced the Allison, I try never take it in and have it worked on, I try to do everything myself. So the trans what is the service time or miles to change fluid? it has synthetic fluid in it, and how hard is it,how many gallons and filters, part #’s
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8 Replies
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Allison has a schedule for fluid and filter changes. The schedule is influenced by how the coach is equipped and used. My memory says regardless of how the coach is set up or used the interval is always 4 years, and the mileage varies based on if you have a retarder or not. Again by memory I think the 4 years comes sooner than mileage based on how I use my coach.
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Used ATF lab analysis, approved by Allison. Here’s a discussion link:
Here’s is a Allison pdf file titled: Technicians Guide to understanding ATF analysis: Allison pdf link
It will take about 7 gals to do a fluid and filter change.
Approved TES 295 fluids are:
Castrol TranSynd
BP Autran Syn 295
BASF Emgard 2805
International Trucks Fleetrite Synthetic ATF
Mobil Delvac 1 Synthetic ATF
CNH HD Synthetic ATF
Mack Bulldog Synthetic ATF
Shell Spirax S6 ATF A295The Allison filter kit part #s are:
Old# 29548987
New# 29558117 -
I think the mileage was 50K, retarder May be less, maybe Jeff will jump in here.
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When Prevost Fort Worth changed mine (755CR) to synthetic a few years back , they said 100,000 miles.
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Different animal. Also the cynic in me says mechanics are way smarter than the books so being the geniuses they are they often provide advice that differs from what the books say.
Unless proven wrong I tend to stick with what our service and owner manual say.
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Allison has an interactive “Fluid & Filter Calculator”. Here’s a link
The first question asks: “do you have Prognostics on ?
Here is a link about that: Allison Prognostics link
When I completed the above Allison Fluid & Filter calculator it stated:
“Transmission protection and fluid change intervals can be optimized by the use of fluid analysis.”
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I plugged in a number of scenarios ranging as low as a couple of thousand miles annually on up and it looks consistent in using 4 years as the change interval.
But if that interval is ignored in some cases the change interval works out to never.
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The Allison filter kit part #s are:
Old# 29548987
New# 29558117I think these filters come in two sizes (2” and 4” sump). My 98 Royale has the 2” sump. It is the same part number from what I understand. I ordered mine today off eBay.
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