1980 Garelli VIP 2spd and it has a rough time getting into 2nd gear, it seems smooth up to about 15mph and then takes way too long trying to shift into 2nd and sometimes wont or kinda surges,jolts. I drained and refilled the oil with fresh 30w. it looked pretty clean in the trans when I had the cover off. Think I just need to replace 1st/2nd gear rubbers?