i have a 93 z28 A4 with 107xxx miles,the transmission seems to shift fine,it never over revs,or downshifts on its own,or anything like,but when i shift from park to D,its kind of a hard shift,and sometimes when it shifts from 1st to 2nd when its in Drive its a hard shift, is the tranny going out?? could I need a new tranny mount??