Help identifying a833

This is all too difficult. remove the side cover, now look at the front gear that is on the input shaft. The next gear will be smaller if OD, or larger if a non OD.

photos of an OD from service manual, in both the left is the front of the trans. Main shaft on top, see how small the overdrive gear is?
counter shaft on bottom, see how large the second gear from left is?

this is a radical difference if you have ever looked inside a manual trans.

they gears normal go from small to large evenly, not big to small then bigger.

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