Hello, I've read that it is not recommended to flush the Allison transmission. Can anyone tell me where this information is officially posted? Either on Allison's website or, more preferably, in the owner's manual? Particulalry for an '07 Classic. Thanks.

2014 chevy silverado 3500 HD 6.6L Duramax / 6 speed Allison... While getting some brake work done, I was thinking of having the transmission flushed. But the mechanic told me that if it's never been done before, I could have a blown transmission within a week. I guess a flush would clean all...

So This is my first post been readin forums here since I invested in a new to me 2007.5 Silverado 3500HD LTZ. it's got just shy of 150K miles on it and since I don't know much of its history I am trying to get all the major maintenance items done before winter.:shock It's my first duramax and...