I just happend to have one on my bench.
10.75 long
11.5 height
8.5 width.
These are close measurements using a tape and eyeball it.
Why do you need to know?
Though I'm not the original requester, thanks for the dimensions. I'm building an adapter out of scrap wood for my floor jack, to use as a transmission jack for the A833. Unfortunately, I don't have the tranny at my current location. It's 400 miles away at my son's house and he's not home to measure it for me. Thanks! O:)