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I hear ya... I knew I wanted to switch but I was worried about making the transition as you are. That's why I bought the new spare transmission in the can. I'd hate to push my advice and have it fail on you. Have you read the factory Allison operator's manual? That's another factor that heavily...

I picked up my truck in Louisiana and drove it home to CA, over 1,700 miles. I changed all the fluids there in LA, and I only drove the truck for a 1/2 hour or so to warm it up beforehand, so I have no real basis to compare to. In general, it runs quite cool, the only time I see it rise is...

No, just the one change when I got the truck last year. I want to do it again and I have the oil, but not the time at the moment... Jon

I switched to Transynd in my HEMTT, but I don't remember exactly how much came out when I drained it... I want to say just under 10 gallons. I brought 15 and had around 5 gallons left. Personally I think switching is the right thing to do, but I acknowledge that a transmission with a lot of...