I just had a reman tranny put in about 3k miles ago. Ive noticed recently that if I accelerate slowly, I can hear a slight thump as the truck starts to move. Then, if Im going really slow and let off the accel to stop, I hear the thump again. Should I be worried? The trans is under warrenty so it's all covered by the big guy if somethin happens.

 

Check the U-joints and the rest of the driveline.