gears are a great mod.on my 91 i had i went from 2:73 to 3:73 that was an awesome difference also.down the street where they were installed i was bangin thirds
i dont know about your area where to get the speedo gear but i heard they dont last long at all,my buddy had one on his 93 cobra and it only lasted a few months
http://hapygas.stangnet.com