Allison Transynd

[Arch Hoagland]

Originally Posted by 70ChevelleSS

Finally got around to changing the fluid and filter last week, it's a 1000. Took almost 15 quarts, that's what I drained out and that's what it took to bring it back up doing a cold check. It had been sitting for more than month with out running the engine.

Wow that's a lot. The most I ever got was just under 13 after it sat for a week or two.

[YC1]

Originally Posted by Unplanned

Transynd it is then. Was just asking. I'm only at 50+ K, so lots of time yet before a change.
Anyone watch the temp on their 1000 6 speed Allison? Mine runs at 175 F, and will climb to 210 F on a hard pull. Sound normal?
Happy Glamping.

Yep! If idling in gear due to traffic the temp can go up so I drop to neutral when possible.

[Chargerman]

210 is not unusual on a long pull. Dropping into neutral at a light is unnecessary. 50k is not too early for a change if your rig has seen a significant amount of heavier work. It’s cheap preventative maintenance considering the cost of transmission work.

[YC1]

Originally Posted by Chargerman

210 is not unusual on a long pull. Dropping into neutral at a light is unnecessary. 50k is not too early for a change if your rig has seen a significant amount of heavier work. It’s cheap preventative maintenance considering the cost of transmission work.

If you are referencing my post, I did not suggest putting it in neutral at a light. In 100 degree weather stuck in a long traffic jam the transmission temps can rise quite a bit. Dropping it in neutral if going to be stopped for several minutes is just a way to get those temps down.

Probably not useful in 40 degree weather.

[hypoxia]

https://www.wwwilliams.com/locations/#map

They have had the best price I have seen.

[Smitty77]

We had Colton Truck do the drain/fill/drive/drain/fill when we shifted to Mobile One TranSynd.

This was ~6 years, and 55K miles ago now.

Due for another filter change. And was wondering if I should just ask them to pull a sample for analysis, or just put those funds towards another drain/fill?

Suspect the Transynd is in good shape, due to low but consistent at temperature miles over the last ~6 years. Transmission has never been near hot enough for concern, including many passages Colorado's mountains. I do usually shift manually while hill climbing, and in descending with Jake too.

Input please on just testing to validate the health, or just go ahead and change, or both (Take a sample to confirm how things look all around for the transmission, but also go ahead and change the full fluid & filter now too.)?

TIA for input, and best to all,
Smitty

[Steve Ownby]

Originally Posted by Smitty77

We had Colton Truck do the drain/fill/drive/drain/fill when we shifted to Mobile One TranSynd.



This was ~6 years, and 55K miles ago now.



Due for another filter change. And was wondering if I should just ask them to pull a sample for analysis, or just put those funds towards another drain/fill?



Suspect the Transynd is in good shape, due to low but consistent at temperature miles over the last ~6 years. Transmission has never been near hot enough for concern, including many passages Colorado's mountains. I do usually shift manually while hill climbing, and in descending with Jake too.



Input please on just testing to validate the health, or just go ahead and change, or both (Take a sample to confirm how things look all around for the transmission, but also go ahead and change the full fluid & filter now too.)?



TIA for input, and best to all,

Smitty

Hey Smitty,

If it were me, I would pull a sample & send to J G Lube Services for analysis. The finding will give you the answer as to whether to just change the filters or do another fluid & filter change. The analysis will also establish a base line for future analysis and give you an idea as to the health of your transmission. Just like a blood test for you.

[dbarton291]

Originally Posted by Smitty77

We had Colton Truck do the drain/fill/drive/drain/fill when we shifted to Mobile One TranSynd.

This was ~6 years, and 55K miles ago now.

Due for another filter change. And was wondering if I should just ask them to pull a sample for analysis, or just put those funds towards another drain/fill?

Suspect the Transynd is in good shape, due to low but consistent at temperature miles over the last ~6 years. Transmission has never been near hot enough for concern, including many passages Colorado's mountains. I do usually shift manually while hill climbing, and in descending with Jake too.

Input please on just testing to validate the health, or just go ahead and change, or both (Take a sample to confirm how things look all around for the transmission, but also go ahead and change the full fluid & filter now too.)?

TIA for input, and best to all,
Smitty

IF they put Mobil 1 in it, that's not TranSynd or TES-295 approved. If they put in Mobil Delvac synthetic transmission fluid, then you got the good stuff. The Mobil Delvac Synthetic is a TES-295 fluid.
There is nothing wrong with the Mobil 1 synthetic. I use it in my cars. If that's what you've got in there, if it were mine, I'd do a fluid analysis just to see how well it's lasting and see if it does need changed. It may not need changed because it sounds like you have a pretty reasonable duty cycle.
I agree with Mr. Ownby even if you've got Delvac, I'd just do a fluid analysis for the reasons he stated. Just an opinion.

[Smitty77]

Thanks Steve/dbarton291.

Since I was going to do the sample anyways, suppose it makes the most sense to wait for the results.

And yes is is the Allison Certified TES-295 Mobil Delvac. So used to typing Mobil One or Mobil 1 over the years of Dino vs Synthetics threads - my fingers just typed Mobile One!

Best,
Smitty

[hzjcm8]

Originally Posted by Smitty77

We had Colton Truck do the drain/fill/drive/drain/fill when we shifted to Mobile One TranSynd.

This was ~6 years, and 55K miles ago now.

Due for another filter change. And was wondering if I should just ask them to pull a sample for analysis, or just put those funds towards another drain/fill?

Suspect the Transynd is in good shape, due to low but consistent at temperature miles over the last ~6 years. Transmission has never been near hot enough for concern, including many passages Colorado's mountains. I do usually shift manually while hill climbing, and in descending with Jake too.

Input please on just testing to validate the health, or just go ahead and change, or both (Take a sample to confirm how things look all around for the transmission, but also go ahead and change the full fluid & filter now too.)?

TIA for input, and best to all,
Smitty

Smitty,
As others have stated, it's best to get the fluid analyzed as that is truly the only way to know the condition of the fluid and the transmission for sure. Otherwise, if you just change out the fluid, you're just "throwing out the baby with the bath water".

The fact is, after years of testing and validation through oil analysis, it's now pretty much guaranteed that the fluid analysis, on Allison Approved TES-295 fluids (Castrol TranSynd, Mobil Delvac Synthetic, Shell SPIRAX S6 295, etc.), will come back good .... but, you want to be sure that it's not contaminated in any way, shape or form. Once you do the double drain and refill procedure, like you had done, the fluid itself will remain very stable for a very long period of time. By stable, I mean the VISCOSITY and OXIDATION RESISTANCE will remain pretty much unchanged over many miles and years of service because that's what the Allison TES-295 specification requires of the fluid through vigorous testing. However, there's a "third leg to the stool" and that is CONTAMINATION. You can have the most stable fluid in the world; but, if it gets contaminated, then it's no longer the same and may need to be changed.

Think of it as a 3-legged stool with the 3 legs being VISCOSITY, OXIDATION RESISTANCE and CONTAMINATION (see attachment). If any of the 3 legs are bad, then the fluid is no longer able to do its' job and needs to be changed.

• VISCOSITY is affected by mechanical stresses
• OXIDATION RESISTANCE is affected by "thermal" stresses
• CONTAMINATION is affected by water, coolant and/or dirt, dust and debris

To learn more about this, please review my Technical Paper at: http://www.jglubricantservices.com/d...ical_sheet.pdf

[vagaron]

I had been looking for a source for a TES 295 compliant fluid. Finally found and bought BP Autran Syn 295 at my local NAPA store for $39.99.

[hzjcm8]

Originally Posted by vagaron

I had been looking for a source for a TES 295 compliant fluid. Finally found and bought BP Autran Syn 295 at my local NAPA store for $39.99.

Excellent fluid. Exact same performance as TranSynd !!

[vito.a]

What year did Allison begin filling new transmissions with Transynd?

[Pusherman]

That's a variable defined by 1) the chassis builder, and 2) the coach builder. In other words, it depends how Monaco ordered it from their chassis builder. Some could have spec'd TranSynd and other coach manufacturers could have spec'd dino oil in the same model year.

However, I would be willing to bet that all Allison's were shipped with TranSynd by about 2006. Before that it's a variable.