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:hzjcm8 wrote:
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.
Back to the original question, I know a broken record, can consumers be safe using D3M products in Allison Transmissions?
Fred
Fredbon (et al),
Some of these older DEXRON-IIIH/MERCON (D3M) products are not compatible with Allison Viton seals. Your seals could harden and crack over time if your transmission was built prior to the serial number break point (2006-2007 timeframe). The problem is that, without undergoing the TES-389 seal test, no one really knows for sure which ones are good and which ones are bad. The only older DEXRON-IIIH/MERCON products that are known to not cause problems with Allison Viton seals are those listed on the TES-389 approved fluids list.
