fd pulls to right during acceleration

[3tegStrong]

we finally got the fd titled and insured again. right now, she's sporting 7600 real miles. william & i drove it some & it still runs/shifts great, but when you accelerate heavily, it pulls to the right pretty hard.

wonder if storage/sitting for almost a year could've caused something in the rear end to lock/seize... or if storing it on the frame lift for a couple months(no pressure on wheels/suspension) could've caused a problem with it.
any input off the top of your minds?
thanks in advance!