Different shudder

Hey guys, Ive read all about the driveline shudder, and how there are endless causes. Also have read about the feeling of driving over small speed bumps shudder. Now I thought that I may have had a torque converter issue, because of the shake I feel when the auto is switching gears. Although I have just entered a new issue. When the truck is in 4 ( the position not 4wd) I get ZERO shake or shudder, only when switched to D does it shake when switching gears. ANYone else have the same issue or suggestions as to what may be happening. If it was something wrong with the tranny wouldnt it shake when either in 4 or D? thanks

 

Anybody? Anyone have any ideas?

 

Sounds like it could be tq converter shudder. It may lock differently when in 4 as opposed to D. Or, it could be a secondary vibe from the tq converter locking. How many miles? Stock?