First some background. I have had a power steering gear box leak on my '91 3FE for quite a while. It got bad enough that I finally decided to rebuild the steering gear box to fix the leak. After I finished the rebuild and filled the system with new ATF (Dex3) I started to have a weird issue. It's not leaking anymore, although the steering feels no tighter or better than before the re-seal. However, on cold days when it has sat for more than a few hours, the steering is REALLY hard for a few minutes. It's like I have NO power steering at all until the system has warmed up. Once it's warm, it feels like it breaks free. It just suddenly starts steering normally. Now for the embarrassing admission of an error I made when I rebuilt the box. I didn't notice at the time because they got away from me, but I ended up with 4 left over ball bearings. I was sick and tired of working on it and had just painted it and didn't want to bugger up any of the new seals, so I just left it. It doesn't seem to act any differently than before except when it's really cold out. I doubt it makes a difference with the problem that I'm having, but I figured I would include that data point just in case. Before the reseal I had been using power steering fluid. While the system was totally dismantled I figured I would change it back to Toyota OEM spec. Does anyone have any recommendations to resolve this issue? Is it because the ATF is too viscous? Could those missing ball bearings cause this problem? I just can't figure it out. Thanks in advance for any insights.