Shudder overdrive torque converter???

[crwnsvn]

I have a 2003 1500 4x4, 115k. With O/D on, at 50-55+ mph, the entire truck shudders, bucks and on one occasion reduced power, the RPM's would not get above 2k, and would not exceed 55mph. I replaced the rear brakes and emergency brakes, U-Joints, rotated and balanced tires. With O/D off, there is no shuddering, but when I reach 50-55+ mph and turn O/D on, the shuddering comes back. The "check engine" light has only flashed a few times, while I was revving up the engine a alot, at high speeds, accelerating and decelerating sporadically. I am still searching for help in diagnosing the problem.


Truck details are as follows:
2004 Ram 1500
4.7L Eng (EVA)/5Spd A/T 5-45Rfe(DGQ)
5-Spd Automatic 545RFE Transmission
Lock-Up Torque Converter
3.92 Axle Ratio
Corporate 9.25 LD Rear Axle
Anti-Spin Differential Rear Axle
4.7L V8 MPI Engine[/COLOR][/COLOR]