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Discussion Starter #1
Hi folks,

My name is Tom Johnson. I was the former Transmission Fluids Engineer for Allison Transmission from 1990 until my retirement in 2009. I worked to develop and release TranSynd for Allison over a 10 year period and I also wrote the Allison TES-295 and TES-389 specifications. I had full responsibility for approval of all transmission fluids for Allison products on a world-wide basis. Since Allison was owned by GM for decades, and as part of my job at Allison, I also served on the ATF Committee for General Motors for several years. And, because Allison produces most of the transmissions for the US Army, I was also a member of the Engine Oil Review Committee for SAE Performance Review Instittute (formerly the Lubricant Review Institute.

These are my credentials. I'm here to help with your questions and to settle any arguments concerning TranSynd, Allison fluid specifications, DEXRON-III, DEXRON-VI, oil formulations, etc. So, as long as I'm not absolutely flooded with stuff, I'll try to keep up.

PS: I couldn't be involved in these forums while in my official capacity at Allison but I always thought I'd get involved once I retired. I own my own oil and coolant analysis business now and do consulting for the oil and additives industry on the side.
 

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Thanks for your stepping forward. I guess the most common question would be; Is transynd the best route to take? I recently drained my 03 and swapped to Transynd.
 

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Welcome to the site. Now maybe some of the concerns over what is the best fluid for the Allison trans can be put to rest. What do you recommend for the Allison 06 and above? Transynd or Dex VI
 

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I just had my trans fluid changed. They put dexIII in. 07.5 3500.
Will this screw up my trans?
Put about 400km on before I found out.
Thanks for input.
Have a feeling you will be a great help to everyone on here.


Martin
 

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Discussion Starter #5
I just had my trans fluid changed. They put dexIII in. 07.5 3500.
Will this screw up my trans?
Put about 400km on before I found out.
Thanks for input.
Have a feeling you will be a great help to everyone on here.


Martin
It won't screw up the transmission but it will degrade TranSynd if that's what was in it. It will eventually lower the viscosity. I'd if you were running TranSynd, you should change it out and reinstall TranSynd. No need to change filters.
 

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Discussion Starter #6
Welcome to the site. Now maybe some of the concerns over what is the best fluid for the Allison trans can be put to rest. What do you recommend for the Allison 06 and above? Transynd or Dex VI
TranSynd is still the best option. Even though Allison changed seal materials to be compatible with DEXRON-VI, TranSynd will last longer and remain more stable over a given time period.
 

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Discussion Starter #7
Thanks for your stepping forward. I guess the most common question would be; Is transynd the best route to take? I recently drained my 03 and swapped to Transynd.
Castaway,

Yes ... it's still the best option. Telll others to forget about DEXRON-III. They're no longer approved or monitored by any OEM, so I'd stay away from them. DEXRON-VI is no longer approved either since Allison is no longer part of GM. Not just because they sold Allison but because now Allison has no voice in any DEXRON-VI changes that GM may decide to do.

Thanks for your question.
 

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Thanks Tom! That was quick.
No, it was dexVI. Not transynd.


Martin
 

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Discussion Starter #9
Thanks Tom! That was quick.
No, it was dexVI. Not transynd.


Martin
If it's DEXRON-VI, the viscosity will still drop over time. If you have the newer DEXRON-VI compatible seals then DEXRON-VI is OK (just no longer recommended in the future).
 

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thanks for your exsperince and welcome
 

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When did allison update the seals? Reason I am asking is most GM dealer only carry dex 6 now. When some one ask for a trans fluid exchange dex 6 goes in everthing. So that could be bad for the ollder ally correct?
 

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Discussion Starter #12
When did allison update the seals? Reason I am asking is most GM dealer only carry dex 6 now. When some one ask for a trans fluid exchange dex 6 goes in everthing. So that could be bad for the ollder ally correct?
Goodwrenchtech,

For anyone unsure about their seals compatibility with DEXRON-VI, I recommend they call the Allison Tech Support Line at 1-800-252-5283 and check your transmission serial number. Allison issued serial number break points for DEXRON-VI compatible seals. I, of course, can't remember the S/Ns. This would be a good "STANDARD PROCEDURE" to implement at all GM dealers. You should forward this to the GM dealer organization through your Sales/Service folks to help out Allison owners.
 

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So, what's a "Sticky"?
A sticky is a post at the beginning of the forum for all to read maybe one of the moderators could help you with that info.
 

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Great to have an engineer on here....plus he is local.

Do you run your oil analysis company from avon?
 

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All 06+ GM's came with DEX6, but the ALLISON S/N breakpoint wasn't until mid year 06. TRANSYND is a good fluid, but speaking from experience it doesn't work well in a performance built ALLISON with the ALTO clutches. SO keep this in mind that quite a few of teh guys here are NOT running ALLISON clutches anylonger, and this changes things a bit. TRANSYND is a very smooth shifting fluid sompaired to DEX3, but with ALTO clutches this isn't good.
 

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im looking at an 07 cc/lb 4x4 if im not mistaken from what ive read so far the seals would be compatible with the transynd fluid? also it only has 52K miles, out of curiousity should i change out the trans fluid for the transynd or leave it as is?
 

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Changing to transynd

Hi Tom glad I found this site, my lucky day.:D
Here id my situation I have an 08 Chevy Duramax.
I recently had a local shop service the Ally trans and he dropped the pan changed the internal filter and external filter and refilled with DexIII and used an additive to "make it identical to Dex VI". I had this done aprox 500 miles ago.
Here are my questions.
1) If I change to Transynd do I need to change the filters again.
2)Can I just empty the pan and add Transynd and run for 1k to 2k miles then empty and add Transynd again without hurting anything?
 
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