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Old 04-27-2011
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Maybe a call to Brad Penn is in order. Maybe they can tell us if they contract out for independent conformance testing of their Dexron III products. GM no longer does it nor do they issue licenses but the specification still exists.
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Old 04-27-2011
ryoung ryoung is offline
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Join Date: Mar 2008
Location: Rodney
Posts: 153

I talked to the Allison mechanic at the dealership today where I was going to purchase some Transynd. He does not sell Dexron III but does sell Transynd. He asked what it was for, and after I told him, he replied that I would be wasting my money using the Transynd, just not enough use or abuse for what I did. He did recommend using the less expensve Dexron III and changing it on a more regular interval with the filters. He was actually going to loose a sale by telling me. That was his recommendation and I am starting to agree with it.
Richard and Ruth Young
1981 FC35
"A Lil' R & R"
Rodney, Ontario
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Old 04-27-2011
markusfmeyer markusfmeyer is offline
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Join Date: Jul 2009
Location: Pennsylvania
Posts: 3,816

Here's my two cents. Biggest killer of transmissions is heat. Synthetics are better at handling that than dino oil. Compared to the cost of a trans, the diff in price between transynd and dino is negligible.
Markus Meyer
Phoenixville, PA
1986 PT40 6V92
VB 1570
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Old 04-28-2011
DW SD DW SD is offline
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Join Date: Jul 2010
Location: Encinitas
Posts: 1,684

I stopped in at the local autoparts store. They sell various versions of non-synthetic Dexron / Mercon ATF ranging in cost from $2.50 to $5 / quart. Chevron calls theirs D/M ATF. Valvoline says Dexron / Mercon and is TES -389 compliant. Others (not all), including Chevron's, are labeled TES - 389 compliant. None are lableled Dexron III. Most of the labels state intended for 2005 and earlier GM transmissions. Some specified as suitable for FORD and Allison's too.

I decided to buy the TES - 389 compliant product. I'm 45 minutes from the nearest heavy truck store. I spent $11 / gallon. Transynd was $41 + 1.5 hour round trip.

Given my annual mileage ~ 5k, I'll probably do annual fluid / filter changes. My trans has about 30k miles on it. I intend to care for it. Fluid and filter change took me about an hour.

I believe I also found out my early PT has an MT 654 - type Allison in front of the 6V92 and not the HT 740. I make this statement as the filter type is for the 654 and not 740. Not definitive, I suppose.

Doug W.
Encinitas CA
2004 M380

Last edited by DW SD; 04-28-2011 at 07:51 PM.
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Old 06-02-2018
jdarst's Avatar
jdarst jdarst is offline
Jay Darst
Join Date: Jan 2008
Location: Rehobeth
Posts: 46
Default Transmission fluid comparison

I hope my attachment made it....
Attached Files
File Type: pdf Trans Fluid comparison 02.20.2017.pdf (34.8 KB, 155 views)

Jay Darst
Dothan, AL
217-971-0036 cell
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