Product review (4 stars): Works.
The inner box (from manufacturer) was marked as being manufactured by Whirlpool. The manufacturer's box was clearly labeled to keep upright, but it was placed into another larger box by Amazon that was not labeled. Therefore, the shaft of the transmission was beating the end of the manufacturer's box. Hopefully this will not lead to problems later. Fortunately, no oil leaked out of the transmission.

I installed the transmission and it fixed my problem with the rinsing spin cycle. My washer is a Whirlpool Design 2000 model LA6300XPW4 and the transmission fit perfectly. The pump cycle makes a bit more noise than I remember (transmission reverses for this cycle). Maybe my pump is getting worn or maybe this new transmission is a bit more noisy in this cycle.

Be sure to clear out the vent hole of the paint covering before installing. Even with the paint removed, I noticed that paint was still in the vent hole so I had to use a push-pin to clear it out.

All in all, it works.