Transmission Fluid Change

[Bruce Anthon]

FYI - I just bought 5 gallons of Castrol T668 at CIT (central Illinois trucks) in Peru, IL. $36.95 / gallon. They have numerous branches in IL. and MO.

[Dave Fernandez]

Check You Tube they have several videos regarding the Fluid and Filter change on the Allison MH 3000 Transmission.

https://www.youtube.com/watch?v=YBN6xrY1IAk

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[ArtJoyce]

Originally Posted by Old Scout

fluid change interval for general use vs severe is filters every 3 years or 36k miles; and fluid and filter every 5 years or 60k--I think???

Which transmission do you have? I will assume it's the Allison 360.

Severe is like the equipment use is mines or earthmoving equipment, maybe a yard-dog.

Most MH fall into normal.

Your MH should have been built using Allison's Transynd TES-295 which I belive was rated ror 100k or 5 years which ever comes first

Allison recomended you upgrade your fluid to transynd TES-668. Pickup a filter kit at an alllison shop they will have the latest filter and be able to tell you which fluid is the latest you should use. You will need your transmission sn and model number.

I change my fluid and filter every 6-7 years. I will never max out the miles, just time out.

[Old Scout]

Ive been "studying" this issue for almost 20 years--until recently, my Allison was a MH3000. Early-on, I decided the Allison guidance was inconsistent from source to source. I decided on the following--when using Transynd?:
1- assuming normal application.
2- assume age time-out vs mileage for RVs.
3- change filters [main and lube] every 3 years.
4- change both filters and fluid every 6 years.
5- do fluid analysis every 2 years to detect abnormal wear or contamination.
PS--Actually, my 2003 MH3000 was one of the last to come with ATF-III. I had to convert it to TES 295 early on.
PSS--wont speak for the "Allison Fluid Guy" but I inferred from his comments that with periodic analysis, you can extended both mileage and time limits?????