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Old 09-17-2023, 06:13 AM   #1
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Transmission fluid change

2004 Kountry Star Cat 330 diesel, 90kmiles
Iím not seeing in the documentation that came with the RV that the transmission fluid has ever been changed. How often should it be changed and how much can I expect to pay to get the job done? Thank you
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Old 09-17-2023, 06:35 AM   #2
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If you search on the forum for this topic, you will find lots of threads and lots of opinions. Some of the opinions are from people that worked or currently work in the industry that know what they are talking about. Others, like me, who don't really know, would tell you to just change it out. If you decide not to change it out, perhaps you can get a sample sent off to check the condition of the fluid. This is one company that does it. There may be others. I used them for my coolant sample. Luckily, I did because they found an issue for me that I was able to address.
Tommy & Franci - Houston (Clear Lake), TX
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Old 09-17-2023, 06:40 AM   #3
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No question, if the transmission fluid is 10 years old, it needs to be changed.

Least expensive quality is a 5 gallon pail of Allison 668 fluid (will leave you about one quart left over) and an Allison filter pack (take your transmission model and serial number found on the driver's side of the transmission so you get the correct filter kit). The kit includes instructions, filters and gaskets you will need.

Nothing complex about doing it. Just need an inch-pound torque wrench.

Been there, done that many times.
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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Old 09-17-2023, 10:38 AM   #4
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Welcome to iRV2 .

You Cat diesel will be attached to an Allison 3000 series transmission and this pdf is the latest service info for Allison transmissions , I've seen.
Attached Files
File Type: pdf Allison fluid and filter info 2021.pdf (960.5 KB, 3 views)
File Type: pdf Allison 3000 Operators Manual.pdf (2.10 MB, 3 views)
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
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Old 09-17-2023, 03:53 PM   #5
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If you don't
O your own oil / filter changes you should bevable to do the tranny.
If you have a shop do oil they should bevable to do tranny. Mine would rather I get the right filter & fluids to save them searching.
Don & Marge
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Old 09-18-2023, 06:33 PM   #6
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My thought is that fluids and filters are CHEAP insurance. If there is no evidence it has been it!
"Second star to the right and straight on 'til morning"
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fluid, newmar, transmission

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