Allison Tranny Oil

usersmanual wrote:

ArchHoagland wrote:
2004 and prior W22 chassis came with Dexron iii. 2005 and up came with Transynd.

Do NOT use Dexron 6.

If you are doing it yourself you need to drain the transmission into a bucket that has quart markings on the side. Refill with exactly that amount. It will usually be about 11 quarts.
Drive the coach 15 to 20 miles and then drain the transmission again and refill. That is what Allison recommends for a complete change.
Allison says do NOT do a pressure flush.

You need to replace the spin-on filter. There is a magnet at the base of it that needs to go on the new filter.

I suggest using Transynd if it doesn't already have it.

I've changed my transmission fluid four times now over the past 12 years/80,000 miles. It's a easy as changing your engine oil and filter.

the unit only holds 13 quarts so to me NO one in their right mind would put in 11 quarts of High$$ 295 oil and drive 20 miles and drain and refill over the dilution of 2 quarts of dex111 or whatever

You need to read the Allison transmission page to find out how to do a complete change and then you will understand.

You can't completely drain all the old fluid out, a lot stays in the converter. Hence they recommend a double drain and refill. One time I let it drain for two days. No help.

Believe me I'm not happy about it but that's how it is.

Although I'm not in my right mind anyways so it doesn't matter.