Thank you for the advice. This morning before driving to work I disconnected the kickdown cable, and indeed the transmission shifted at lower RPMs through all of the gears. The transmission wouldn't kick down to a lower gear, as would be expected with the kickdown cable disconnected. So, though I thought I had the cable completely loosened before, it must have had a little bit of tension on it. I've now reconnected the cable and adjusted it to where it's almost loose. I'll drive to work again in tomorrow and see how it does, and will let you know.

Exactly what my engine code is I'm not sure. It has B230 embossed on the lower passenger side of the block, near the oil filter. It's in a '93 940 non-turbo wagon. I didn't make note of the code on the transmission nameplate when I installed it, but it came from a '94 940 turbo sedan.

Thanks again for your help, and thanks also to the other gentleman who weighed in with some information and suggestions. I'll let y'all know tomorrow how it goes.