shuddering when take foot of pedal

well i just got the svx back after a long 3 weeks waiting to have a wheel bearing fixed. soon after taking it out i noticed a shuddering in the car when i take my foot of the throttle. i don't know if this has anything to do with the new bearing or the transmission.( oh i hope to god it doesn't.) i was thinking of having the tranny serviced since i work at a dealership and it would be cheaper than most other places but i dont know if it will be necessary. everypenny counts when it comes to this car. help please i don't want to miss my baby again for another 3 or more weeks.
jon meyer