Alright here's what I've got. It's a 78 F250 4wd with the stock transfer case and axles. I've got Warn manual lock out hubs. Here's the problem. When I've got the hubs locked, and the transfer case in 2wd the front tires lock up in reverse, and I can't steer going forward. When I put it in 4wd at slower speeds the steering wheel jerks really hard opposite the way that I'm turning. The left hub is a little loose and the truck has brand new U-Joints. Does anybody have any idea what the problem might be? We're getting a lot of snow around here now, and my bad 4wd almost killed me today. Hence the not being able to turn part. Thanks a lot to anybody who can help me out.