Allison 3000 transmission

[Ed_Manifold]

I had my Allison 3000 transmission oil changed to Trans Syn synthetic fluid at 34,911 on 2/12/15. I have now just under 50,000 miles and my question is should I have the transmission fluid changed again? I understand at the fluid change at 34,000 that the oil in the torque converter was not changed so this change would add too the impurity of the synthetic fluid. I also wondered if I waited too long to make the second synthetic change? my transmission seems to perform perfectly. Any thoughts or ideas? The diesel engine is the Cat C7.
Thank-you

[Ed_Manifold]

I would like to thank everyone who responded to my topic question about the changing of my transmission fluid. I have an appointment for next Tuesday to do the fluid change.They will use the Transynd TES 668. One of the responses gave me a link to an Allison site stating that they are using this fluid in all of their transmissions.

Thanks again for the help.

[MountainAir05]

Sorry for the rant:

[wolfe10]

Allison's new generation fluid Transynd TES 668.

It supersedes Transynd TES 295 and is backwards compatible.

Allison video:

https://www.youtube.com/watch?v=T3XU2BEHBV8



Stick with the change interval based on your current fluid's recommended change interval which is affected by Allison's duty rating. Allison classifies any transmission with a retarder as "severe duty".

And, when you do change, go to the improved TES 668. I visited with Tom Johnson who helped develop Transynd TES 295 and he highly recommends going to the TES 668 at the next change interval as the additive package is even improved over the TES 295. Basically, there have been strides in chemistry over the last decade! Take advantage of them.

[udidwht]

No combustion process going on in a transmission so a time based interval would not apply. Trans syn fluid can live 100K easily.

[wolfe10]

Guess I am conservative when it comes to fluid changes-- much cheaper than the machinery they lubricate.

6 1/2 years-- I would change it.

[Blaster_Man]

As long as it tests good, no change is required...per Allison.

[wolfe10]

After the first change to Transynd, according to Allison, you stay with the service interval for Dexron.

After the second change with Transynd, you go to the Transynd service interval.

Very interested in learning more about Allison's new ATF TES 668 and in what way it is different than the Transynd we have "known and loved" all these years.

[MountainAir05]

Allison is still showing every 48 months for a fluid change. I think you have past that mark.

On ours when its due a fluid change I replace the filters so don't have to open it up again for a while. I can feel a smoother shift when I do ours. Even though I was smooth before it even better to me when its change completely. We have the 4000.

[Blaster_Man]

Have the fluid tested by JG Labs. I have it done once a year, their report will tell you everything you need to know.

http://www.jglubricantservices.com/

[Ivylog]

No.

[Lwiddis]

What does Allison recommend?