Update - Auto Trans Locking Up
Thanks for the suggestions on my auto trans lockup problem. I called a trans shop and they said that low fluid, or binding kickdown linkage could cause the torque converter to lock up. I was in the process of installing a lokar shift cable, so I finished that, and added a quart of trans fluid and the jeep works great (after I warmed up the transmission I checked the fluid and it was more or less full). I don't know if the fluid or the kickdown linkage was the problem, but it works now.
Actually the shifting is much better with the lokar cable than with the stock wagoneer kickdown linkage. Maybe I didin't have the stock stuff on correctly... Who knows.