I picked up this g20 for $150. its an unmolested 5 speed and has perfect interior/exterior. The car starts and runs rough with a push start. I'm thinking it is a timing or cap/rotor issue. My problem is if the transmission is a limited slip or not. I know some b13 sentras had limited slips from the factory and some didn't. Is there anyway to check it by the vin? I know there is supposed to be a big manly bulge on the transmission if it has a limited slip but i can't get a good look at it.