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Old 02-26-2007, 05:41 PM   #1
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The new Dextron VI transmission fluid apparently is not compatible with the seals in Allison Transmissions.
Effective December 31, 2006, General Motors Corporation will no longer license DEXRONŽ III automatic transmission fluid, making this fluid obsolete. Allison is currently working with the oil and additives industry to develop DEXRONŽ VI fluids.
DEXRONŽ VI fluids are NOT direct replacements for DEXRONŽ III fluids. Seal and O-ring materials used in Allison 1000, 2000, 3000 and 4000 Product Family transmissions are being changed for compatibility with DEXRONŽ VI fluids. The link below includes the Allison information on the new fluid.....???
Dexron V (not VI) is in the stores and indicates it is compatible with Dextron II, IIE and III..It's also expensive...


http://www.macktrucks.com/assets/mac...s/sb019006.pdf
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Old 02-26-2007, 05:41 PM   #2
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The new Dextron VI transmission fluid apparently is not compatible with the seals in Allison Transmissions.
Effective December 31, 2006, General Motors Corporation will no longer license DEXRONŽ III automatic transmission fluid, making this fluid obsolete. Allison is currently working with the oil and additives industry to develop DEXRONŽ VI fluids.
DEXRONŽ VI fluids are NOT direct replacements for DEXRONŽ III fluids. Seal and O-ring materials used in Allison 1000, 2000, 3000 and 4000 Product Family transmissions are being changed for compatibility with DEXRONŽ VI fluids. The link below includes the Allison information on the new fluid.....???
Dexron V (not VI) is in the stores and indicates it is compatible with Dextron II, IIE and III..It's also expensive...


http://www.macktrucks.com/assets/mac...s/sb019006.pdf
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Old 02-27-2007, 05:19 AM   #3
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Sounds like another good reason to go with Trans-Synd when my service time rolls around.
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Old 02-27-2007, 09:01 AM   #4
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I suspect Dextron III will be around for years down the road, Allison is not the only user of this fluid. Possibly the price will go down since it will longer be attached to licensing from GM.

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Old 02-27-2007, 09:03 AM   #5
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by paz:
Sounds like another good reason to go with Trans-Synd when my service time rolls around. </div></BLOCKQUOTE>If you are a late 2005 you may already be equipped with Transynd.

If not I agree with your statement.
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Old 02-27-2007, 02:45 PM   #6
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by DriVer:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by paz:
Sounds like another good reason to go with Trans-Synd when my service time rolls around. </div></BLOCKQUOTE>If you are a late 2005 you may already be equipped with Transynd.

If not I agree with your statement. </div></BLOCKQUOTE>

Checked my S/N with WCC shortly after I took delivery because I heard they switched over to all TranSynd. My chassis was built about a week or two too early.
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Old 02-27-2007, 04:40 PM   #7
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Since there are about a zillion cars, SUVs and trucks on the road that require Dexron III in their transmissions and power steering units, I doubt very seriously if "obsolete" means "unavailable". There will be soon be a riot if it does and Dexron VI is not an acceptable substitute.

Checking further, I see that GM claims that Dexron VI is "backward compatible" with Dexron III. But if Allison (a division of GMC) says it is incompatible with their application, isn't it likely there will be others too? By the way, GM also says it will not support use of Dexron III in Gm transmissions - not sure where that leaves Allison.

It's always best to get your info from the horse's mouth (rather than the other end), so here is a link to GM's own announcement. Unfortunately, you need Microsoft Word to view it, though Windows Wordpad might substitute OK.

GM's Dexron VI statement
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Old 03-19-2007, 09:40 AM   #8
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What about Auto Parts stores selling Dexron III under there name?
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Old 03-19-2007, 11:25 AM   #9
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Hooligan:
The new Dextron VI transmission fluid apparently is not compatible with the seals in Allison Transmissions.
</div></BLOCKQUOTE>

Interesting!

The owner's manual for my Alison equipped pickup truck says to use only DEXRONŽ VI.

I smell something fishy here, not sure what it is.
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Old 03-19-2007, 12:05 PM   #10
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I think he is referring to previous model years transmissions that specified Dexron III (or Tran Synd synthetic). Some 2006 and (as far as I know) all 2007 GM vehicles specify Dexron VI and of course are compatible with it.
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Old 03-19-2007, 12:56 PM   #11
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Gary,

That makes sense, couldn't imagine GM backing off of DEXRONŽ VI after making it a maintenance requirement.
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