some do and some don't. my 91 has the long gear and some later ones that the short gear. the 91 was slow by 8 mph with a 33 toth gear. i figured it needed a 28.5 toot but only had a 27 tooth. put it in and now it is 4 mph too fast. i need the 28/29 tooth. my 91 id 518 od without lockup.