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I read a very recent (past few months old) report that Allison no longer acknowledges C-4 as an acceptable fluid for their MT 654CR. This report was from Allison. I have it bookmarked on my laptop, and can't give you the citation right now. But let's just say that C-4 was good enough by them...

http://www.allisontransmission.com/servlet/DownloadFile?Dir=publications/pubs&FileToGet=MT1357EN.pdf http://www.allisontransmission.com/servlet/DownloadFile?Dir=publications/pubs&FileToGet=OM1334EN.pdf The above are the "Mechanic's Tips" for Allison transmissions, including the MT series...

Hello, Juan. Yes, I am aware that there are many dissenting opinions. I don't know enough to get involved in that matter. If I change fluids is there really an internal filter on this Allison, in addition to the external filter. I noted in another response that I was told that there is no...

Thanks, Jeff. I will now stop saying "I'm sorry." I might still have to explain that "It's not me," though, for a few jokesters.

Hello, Mark. Born and raised in Corona. Left after grad from HS in 64; never come back except for reunions. Anyway, I wanted to draw attention to your "find" of the piping plumbed into the intake behind the filter canister. I suspect one of these is a transmission vent. As noted, after a...

Me Too I realize this is an old thread, but thought I'd try. I've had my 923 for about 900 miles now. Perfect machine at first. Whenever I'd shut it down there is a trumpet sound from the intake, and as I dismount I always say "Excuse me." I never thought much about it. But I just returned...