hey, i need to know if the gear ratios are different between a 1988 sunbird gt and a 1991 sunbird, both 5-speeds, my tranny in the gt is failing and i have the oppourtunity to buy a used gt tranny for 500 or a better condition 1991 for a hundred bucks less and 200 kilometres less driving to get it. My gt has a LSD and was wondering if the 91 base models came with them, or if i can put my LSD into it. need the help quick guys.