The plug appears to be the same. The shift and kick down linkage connections appear to be the same. The driveshaft output is the same, the speedometer connection is the same. Both measure the same length. We grew concerned when we saw the trans cooler lines on the 91 were so much larger then the 89, and all action stopped.

The raised numbers on the bell housings are different, I assumed it was because of the different years.

Will the torque converter to flywheel pattern be the same?

I don't have the time or space to do this, so my brother in law is performing the trans swap, along with other things. He is a good backyard mechanic but was concerned about the line differences, and he says he is only doing this once. Gene