grinding sound upon 1st gear acceleration

Hi,

Just drove my 93 Integra for the first time in one year. I changed engine and auto tranny oil. Car drives fine, but during any acceleration with 1st and 2nd gear, there is a strange grinding noise, like tire rubbing against something. Faster the acceleration, the louder the noise. I can barely hear it during 3rd and 4th gear hard acceleration. There is no noise at all when driven in reverse or when cruising at any speed. I cannot remember if this problem existed one year ago or not. This 'Teg was a backup car, and it was rarely driven. What do you think is the problem? Thanks!