I have a 98 Ram 1500 4x4 ext. cab. Between 50 - 60 mph I get a very noticeable shudder. I just had the tranny rebuilt partially because it was doing this and also making a really bad vibration because of the torque converter. I thought by having the tranny rebuilt would take care of it but I think that maybe by having to wait so long to have the one problem fixed that it may have cause another. (Warranty company wouldn't fix it because it hadn't completely failed) Has anyone else had a problem like this before? Any help would be great.

 

Don't know what kind of shuddering for sure you have, but are your tires balanced, then check the universal joints on the drive shafts and front axles. I had a vibration in the front end and turns out the u-joints were going bad.