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Old 05-01-2011, 02:27 PM   #1 (permalink)
hzjcm8
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Former Allison Fluids Engineer (Here to Help)

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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Old 05-01-2011, 02:43 PM   #2 (permalink)
Castaway
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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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Old 05-01-2011, 02:44 PM   #3 (permalink)
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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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Old 05-01-2011, 02:47 PM   #4 (permalink)
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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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Old 05-01-2011, 02:53 PM   #5 (permalink)
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Quote:
Originally Posted by Dutchdmax View Post
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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Old 05-01-2011, 02:55 PM   #6 (permalink)
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Quote:
Originally Posted by lbzraptor View Post
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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Old 05-01-2011, 02:58 PM   #7 (permalink)
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Quote:
Originally Posted by Castaway View Post
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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Old 05-01-2011, 03:03 PM   #8 (permalink)
Dutchdmax
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Thanks Tom! That was quick.
No, it was dexVI. Not transynd.


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Old 05-01-2011, 03:25 PM   #9 (permalink)
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Quote:
Originally Posted by Dutchdmax View Post
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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Old 05-01-2011, 03:33 PM   #10 (permalink)
maxdout1
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thanks for your exsperince and welcome
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