Here is the link to the brochure on specs on the Allison tranny website, I can't make it a clicky because it has a percent sign in it and for some reason this webpage hates percent signs. Open the brochure and go down to the capacities and it says 29 and 26 quarts for the Allison 3000 MH.
Okay, it won't even let me post the link at all because of the percent sign. So go here and the link at the top down loads the spec sheet:
SPEC SHEET 3000 MHI don't see model years in this flyer so is this new tranny's that take 29 quarts and the older ones only take 19?