Allison 1000
I know this topic has been covered in the past, but I can't seem to find the right answer. I am planning a change over to Transynd using the double drain and fill method. For the first drain and fill,...
Forum Discussion
fredbon wrote:,
What am I missing, I didn't see any Dextron III brand products, just the equivalent products. Back to the previous recommendations, Dextron Brand is no longer approved.
Fred
Allison TES-389 approved products were all, at one time, GM DEXRON-IIIH licensed products. However, the GM DEXRON-IIIH specification was obsoleted after DEXRON-VI hit the market. So, those older DEXRON-IIIH products lost their GM licenses. The word DEXRON (all in caps with a circle R) is a GM owned trademark. After the DEXRON-IIIH specification was obsoleted, manufacturers of those products could no longer legally put the word "DEXRON" on the product labels or containers. That's why these older DEXRON-III products, that are still on the market today, carry the D3M designation. Most of those older products passed both the GM DEXRON-III (D3) specification and the Ford MERCON (M) specification. So, manufacturers began to list their older DEXRON-IIIH/MERCON products using the abbreviation "D3M". They were (and still are) trying to tell the consumer that their fluids pass both the GM DEXRON-IIIH and the Ford MERCON specifications.
Note: I know this because I used to be on the GM Automatic Transmission Fluid Committee that granted GM DEXRON-IIIH licenses. In fact, I go back to 1990 when GM still had the DEXRON-II and DEXRON-IIE specifications.
