Change from 4-speed to 3w/OD

I have to respectfully disagree with RustyRatRod. I agree that forward gears should be counted, but only until you get to a 1:1 gear ratio which, in the case of the A833 OD tranny, is 3rd gear. '4th' gear is an overdrive ratio, thus, it truly is a 3-speed overdrive. Hate how tight 1st gear is to 2nd. It's like the Power Glide of manual transmissions.

So, like I said above, a T56 is a 4 speed with dual overdrive then?

No, it's a 6 speed.

And actually, in the 833OD the gear that's the OD gear is actually 3rd gear in the box. It's 4th that's still 1:1. That's why the shift lever is flipped on the 833OD boxes.